ota.c File Reference

Implementation of the AWS IoT Over-The-Air Updates Client Library. More...

#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include "ota.h"
#include "ota_config.h"
#include "ota_config_defaults.h"
#include "ota_base64_private.h"
#include "ota_platform_interface.h"
#include "ota_private.h"
#include "ota_interface_private.h"
#include "ota_os_interface.h"
#include "core_json.h"
#include "ota_appversion32.h"

Data Structures
struct	OtaStateTableEntry_t
	OTA Agent state table entry. More...

Macros
#define	U16_OFFSET(type, member)   ( ( uint16_t ) offsetof( type, member ) )
	Offset helper.

Typedefs
typedef OtaErr_t(*	OtaEventHandler_t) (const OtaEventData_t *pEventMsg)
	OTA event handler definition.

Functions
static IngestResult_t	ingestDataBlock (OtaFileContext_t *pFileContext, const uint8_t *pRawMsg, uint32_t messageSize, OtaPalStatus_t *pCloseResult)
	Ingest a data block. More...
static IngestResult_t	processDataBlock (OtaFileContext_t *pFileContext, uint32_t uBlockIndex, uint32_t uBlockSize, OtaPalStatus_t *pCloseResult, uint8_t *pPayload)
	Validate the incoming data block and store it in the file context. More...
static IngestResult_t	ingestDataBlockCleanup (OtaFileContext_t *pFileContext, OtaPalStatus_t *pCloseResult)
	Free the resources allocated for data ingestion and close the file handle. More...
static OtaFileContext_t *	getFileContextFromJob (const char *pRawMsg, uint32_t messageLength)
	Get the File Context From Job Document. More...
static DocParseErr_t	validateJSON (const char *pJson, uint32_t messageLength)
	Validate JSON document and the DocModel. More...
static DocParseErr_t	extractParameter (JsonDocParam_t docParam, void *pContextBase, const char *pValueInJson, size_t valueLength)
	Store the parameter from the json to the offset specified by the document model. More...
static DocParseErr_t	parseJSONbyModel (const char *pJson, uint32_t messageLength, JsonDocModel_t *pDocModel)
	Extract the desired fields from the JSON document based on the specified document model. More...
static DocParseErr_t	decodeAndStoreKey (const char *pValueInJson, size_t valueLength, void *pParamAdd)
	Decode the base64 encoded file signature key from the job document and store it in file context. More...
static DocParseErr_t	extractAndStoreArray (const char *pKey, const char *pValueInJson, size_t valueLength, void *pParamAdd, uint32_t *pParamSizeAdd)
	Extract the value from json and store it into the allocated memory. More...
static DocParseErr_t	verifyRequiredParamsExtracted (const JsonDocParam_t *pModelParam, const JsonDocModel_t *pDocModel)
	Check if all the required parameters for job document are extracted from the JSON. More...
static OtaErr_t	validateUpdateVersion (const OtaFileContext_t *pFileContext)
	Validate the version of the update received. More...
static OtaJobParseErr_t	handleCustomJob (const char *pJson, uint32_t messageLength)
	Check if the JSON can be parsed through the app callback if initial parsing fails. More...
static OtaJobParseErr_t	verifyActiveJobStatus (OtaFileContext_t *pFileContext, OtaFileContext_t **pFinalFile, bool *pUpdateJob)
	Check if the incoming job document is not conflicting with current job status. More...
static OtaJobParseErr_t	validateAndStartJob (OtaFileContext_t *pFileContext, OtaFileContext_t **pFinalFile, bool *pUpdateJob)
	Check if all the file context params are valid and initialize resources for the job transfer. More...
static OtaFileContext_t *	parseJobDoc (const JsonDocParam_t *pJsonExpectedParams, uint16_t numJobParams, const char *pJson, uint32_t messageLength, bool *pUpdateJob)
	Parse the OTA job document, validate and return the populated OTA context if valid. More...
static bool	validateDataBlock (const OtaFileContext_t *pFileContext, uint32_t blockIndex, uint32_t blockSize)
	Validate block index and block size of the data block. More...
static IngestResult_t	decodeAndStoreDataBlock (OtaFileContext_t *pFileContext, const uint8_t *pRawMsg, uint32_t messageSize, uint8_t **pPayload, uint32_t *pBlockSize, uint32_t *pBlockIndex)
	Decode and ingest the incoming data block. More...
static bool	otaClose (OtaFileContext_t *const pFileContext)
	Close an open OTA file context and free it. More...
static void	otaTimerCallback (OtaTimerId_t otaTimerId)
	OTA Timer callback. More...
static OtaErr_t	setImageStateWithReason (OtaImageState_t stateToSet, uint32_t reasonToSet)
	Internal function to set the image state including an optional reason code. More...
static OtaErr_t	updateJobStatusFromImageState (OtaImageState_t state, int32_t subReason)
	Internal function to update the job status to the jobs service from current image state. More...
static void	agentShutdownCleanup (void)
	A helper function to cleanup resources during OTA agent shutdown.
static void	dataHandlerCleanup (void)
	A helper function to cleanup resources when data ingestion is complete.
static DocParseErr_t	initDocModel (JsonDocModel_t *pDocModel, const JsonDocParam_t *pBodyDef, void *contextBaseAddr, uint32_t contextSize, uint16_t numJobParams)
	Prepare the document model for use by sanity checking the initialization parameters and detecting all required parameters. More...
static void	initializeAppBuffers (OtaAppBuffer_t *pOtaBuffer)
	Initialize buffers for storing the file attributes. More...
static void	initializeLocalBuffers (void)
	Initialize jobId and protocol buffers.
static uint32_t	searchTransition (const OtaEventMsg_t *pEventMsg)
	Search the state transition table for the entry based on current state and incoming event. More...
static OtaErr_t	processValidFileContext (void)
	Initiate download if not in self-test else reboot. More...
static void	handleSelfTestJobDoc (OtaFileContext_t *pFileContext)
	Validate update version when receiving job doc in self test state. More...
static OtaErr_t	processNullFileContext (void)
	Handle invalid file context. More...
static bool	platformInSelftest (void)
	Check if the platform is in self-test. More...
static void	handleUnexpectedEvents (const OtaEventMsg_t *pEventMsg)
	Function to handle events that were unexpected in the current state. More...
static void	freeFileContextMem (OtaFileContext_t *const pFileContext)
	Free or clear multiple buffers used in the file context. More...
static void	handleJobParsingError (const OtaFileContext_t *pFileContext, OtaJobParseErr_t err)
	Handle job parsing error. More...
static void	receiveAndProcessOtaEvent (void)
	Receive and process the next available event from the event queue. More...
static OtaErr_t	startHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	requestJobHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	processJobHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	inSelfTestHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	initFileHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	processDataHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	requestDataHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	shutdownHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	closeFileHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	userAbortHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	suspendHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	resumeHandler (const OtaEventData_t *pEventData)
	More...
static OtaErr_t	jobNotificationHandler (const OtaEventData_t *pEventData)
	More...
static void	executeHandler (uint32_t index, const OtaEventMsg_t *const pEventMsg)
	More...
void	OTA_EventProcessingTask (void *pUnused)
	OTA agent event processing loop. More...
bool	OTA_SignalEvent (const OtaEventMsg_t *const pEventMsg)
	Signal event to the OTA Agent task. More...
OtaErr_t	OTA_Init (OtaAppBuffer_t *pOtaBuffer, OtaInterfaces_t *pOtaInterfaces, const uint8_t *pThingName, OtaAppCallback_t OtaAppCallback)
	OTA Agent initialization function. More...
OtaState_t	OTA_Shutdown (uint32_t ticksToWait, uint8_t unsubscribeFlag)
	Signal to the OTA Agent to shut down. More...
OtaState_t	OTA_GetState (void)
	Get the current state of the OTA agent. More...
OtaErr_t	OTA_GetStatistics (OtaAgentStatistics_t *pStatistics)
	Get the statistics of OTA message packets. More...
OtaErr_t	OTA_CheckForUpdate (void)
	Request for the next available OTA job from the job service. More...
OtaErr_t	OTA_ActivateNewImage (void)
	Activate the newest MCU image received via OTA. More...
OtaErr_t	OTA_SetImageState (OtaImageState_t state)
	Set the state of the current MCU image. More...
OtaImageState_t	OTA_GetImageState (void)
	Get the state of the currently running MCU image. More...
OtaErr_t	OTA_Suspend (void)
	Suspend OTA agent operations . More...
OtaErr_t	OTA_Resume (void)
	Resume OTA agent operations . More...
const char *	OTA_Err_strerror (OtaErr_t err)
	Error code to string conversion for OTA errors. More...
const char *	OTA_JobParse_strerror (OtaJobParseErr_t err)
	Error code to string conversion for OTA Job Parsing errors. More...
const char *	OTA_OsStatus_strerror (OtaOsStatus_t status)
	Status code to string conversion for OTA OS status. More...
const char *	OTA_PalStatus_strerror (OtaPalMainStatus_t status)
	Status code to string conversion for OTA PAL status. More...

Variables
static OtaControlInterface_t	otaControlInterface
	OTA control interface.
static OtaDataInterface_t	otaDataInterface
	OTA data interface.
static OtaAgentContext_t	otaAgent
	This is THE OTA agent context and initialization state. More...
static OtaStateTableEntry_t	otaTransitionTable []
	Transition table for the OTA state machine. More...
static const char *	pOtaAgentStateStrings [OtaAgentStateAll+1]
	More...
static const char *	pOtaEventStrings [OtaAgentEventMax]
	More...
static const JsonDocParam_t	otaJobDocModelParamStructure [OTA_NUM_JOB_PARAMS]
	This is the OTA job document model describing the parameters, their types, destination and how to extract. More...
static uint8_t	pJobNameBuffer [OTA_JOB_ID_MAX_SIZE]
	More...
static uint8_t	pProtocolBuffer [OTA_PROTOCOL_BUFFER_SIZE]
	More...
static Sig256_t	sig256Buffer
	More...

Detailed Description

Implementation of the AWS IoT Over-The-Air Updates Client Library.

Function Documentation

ingestDataBlock()

static IngestResult_t ingestDataBlock ( OtaFileContext_t *  pFileContext, const uint8_t *  pRawMsg, uint32_t  messageSize, OtaPalStatus_t *  pCloseResult  )

static

Ingest a data block.

A block of file data was received by the application via some configured communication protocol. If it looks like it is in range, write it to persistent storage. If it's the last block we're expecting, close the file and perform the final signature check on it. If the close and signature check are OK, let the caller know so it can be used by the system. Firmware updates generally reboot the system and perform a self test phase. If the close or signature check fails, abort the file transfer and return the result and any available details to the caller.

Parameters

[in]	pFileContext	Information of file to be streamed.
[in]	pRawMsg	Raw job document.
[in]	messageSize	Length of document.
[in]	pCloseResult	Result of closing file in PAL.

Returns

IngestResult_t IngestResultAccepted_Continue if successful, other error for failure.

processDataBlock()

static IngestResult_t processDataBlock ( OtaFileContext_t *  pFileContext, uint32_t  uBlockIndex, uint32_t  uBlockSize, OtaPalStatus_t *  pCloseResult, uint8_t *  pPayload  )

static

Validate the incoming data block and store it in the file context.

Parameters

[in]	pFileContext	Information of file to be streamed.
[in]	uBlockIndex	Incoming block index.
[in]	uBlockSize	Incoming block size.
[out]	pCloseResult	Result of closing file in PAL.
[in]	pPayload	Data from the block.

Returns

IngestResult_t IngestResultAccepted_Continue if successful, other error for failure.

ingestDataBlockCleanup()

static IngestResult_t ingestDataBlockCleanup ( OtaFileContext_t *  pFileContext, OtaPalStatus_t *  pCloseResult  )

static

Free the resources allocated for data ingestion and close the file handle.

Parameters

[in]	pFileContext	Information of file to be streamed.
[out]	pCloseResult	Result of closing file in PAL.

Returns

IngestResult_t IngestResultAccepted_Continue if successful, other error for failure.

getFileContextFromJob()

static OtaFileContext_t * getFileContextFromJob ( const char *  pRawMsg, uint32_t  messageLength  )

static

Get the File Context From Job Document.

We received an OTA update job message from the job service so process the message and update the file context.

Parameters

[in]	pRawMsg	Raw job document.
[in]	messageLength	length of document.

Returns

OtaFileContext_t* Information of file to be streamed.

validateJSON()

static DocParseErr_t validateJSON ( const char *  pJson, uint32_t  messageLength  )

static

Validate JSON document and the DocModel.

Parameters

[in]	pJson	JSON job document.
[in]	messageLength	Length of the job document.

Returns

DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

extractParameter()

static DocParseErr_t extractParameter ( JsonDocParam_t  docParam, void *  pContextBase, const char *  pValueInJson, size_t  valueLength  )

static

Store the parameter from the json to the offset specified by the document model.

Parameters

[in]	docParam	Structure to store the details of keys and where to store them.
[in]	pContextBase	Start of file context.
[in]	pValueInJson	Pointer to the value of the key in JSON buffer.
[in]	valueLength	Length of the value.

Returns

DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

parseJSONbyModel()

static DocParseErr_t parseJSONbyModel ( const char *  pJson, uint32_t  messageLength, JsonDocModel_t *  pDocModel  )

static

Extract the desired fields from the JSON document based on the specified document model.

Parameters

[in]	pJson	JSON job document.
[in]	messageLength	Length of the job document.
[in]	pDocModel	Details of expected parameters in the job doc.

Returns

DocParseErr_t DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

decodeAndStoreKey()

static DocParseErr_t decodeAndStoreKey ( const char *  pValueInJson, size_t  valueLength, void *  pParamAdd  )

static

Decode the base64 encoded file signature key from the job document and store it in file context.

Parameters

[in]	pValueInJson	Pointer to the value of the key in JSON buffer.
[in]	valueLength	Length of the value.
[out]	pParamAdd	Pointer to the location where the value is stored.

Returns

DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

extractAndStoreArray()

static DocParseErr_t extractAndStoreArray ( const char *  pKey, const char *  pValueInJson, size_t  valueLength, void *  pParamAdd, uint32_t *  pParamSizeAdd  )

static

Extract the value from json and store it into the allocated memory.

Parameters

[in]	pKey	Name of the Key to extract.
[in]	pValueInJson	Pointer to the value of the key in JSON buffer.
[in]	valueLength	Length of the value.
[out]	pParamAdd	Pointer to the location where the value is stored.
[in]	pParamSizeAdd	Size required to store the param.

Returns

DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

verifyRequiredParamsExtracted()

static DocParseErr_t verifyRequiredParamsExtracted ( const JsonDocParam_t *  pModelParam, const JsonDocModel_t *  pDocModel  )

static

Check if all the required parameters for job document are extracted from the JSON.

Parameters

[in]	pModelParam	Structure to store the details of keys and where to store them.
[in]	pDocModel	Details of expected parameters in the job doc.

Returns

DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

validateUpdateVersion()

static OtaErr_t validateUpdateVersion ( const OtaFileContext_t *  pFileContext )

static

Validate the version of the update received.

Parameters

[in]

pFileContext

Information of file to be streamed.

Returns

OtaErr_t OtaErrNone if successful, other error codes if failure.

handleCustomJob()

static OtaJobParseErr_t handleCustomJob ( const char *  pJson, uint32_t  messageLength  )

static

Check if the JSON can be parsed through the app callback if initial parsing fails.

Parameters

[in]	pJson	JSON job document.
[in]	messageLength	Length of the job document.

Returns

OtaJobParseErr_t OtaJobParseErrNone if successful, other error codes if failure.

verifyActiveJobStatus()

static OtaJobParseErr_t verifyActiveJobStatus ( OtaFileContext_t *  pFileContext, OtaFileContext_t **  pFinalFile, bool *  pUpdateJob  )

static

Check if the incoming job document is not conflicting with current job status.

Parameters

[in]	pFileContext	Information of file to be streamed.
[out]	pFinalFile	File that stores all extracted params.
[out]	pUpdateJob	Represents if the job is accepted.

Returns

OtaJobParseErr_t OtaErrNone if successful, other error codes if failure.

validateAndStartJob()

static OtaJobParseErr_t validateAndStartJob ( OtaFileContext_t *  pFileContext, OtaFileContext_t **  pFinalFile, bool *  pUpdateJob  )

static

Check if all the file context params are valid and initialize resources for the job transfer.

Parameters

[in]	pFileContext	Information of file to be streamed.
[out]	pFinalFile	File that stores all extracted params.
[out]	pUpdateJob	Represents if the job is accepted.

Returns

OtaJobParseErr_t OtaJobParseErrNone if successful, other error codes if failure.

parseJobDoc()

static OtaFileContext_t * parseJobDoc ( const JsonDocParam_t *  pJsonExpectedParams, uint16_t  numJobParams, const char *  pJson, uint32_t  messageLength, bool *  pUpdateJob  )

static

Parse the OTA job document, validate and return the populated OTA context if valid.

Parameters

[in]	pJsonExpectedParams	Structure to store the details of keys and where to store them.
[in]	numJobParams	Number of parameters to be extracted.
[in]	pJson	JSON job document.
[in]	messageLength	Length of the job document.
[in]	pUpdateJob	Represents if the job is accepted.

Returns

OtaFileContext_t* File context to store file information.

validateDataBlock()

static bool validateDataBlock ( const OtaFileContext_t *  pFileContext, uint32_t  blockIndex, uint32_t  blockSize  )

static

Validate block index and block size of the data block.

Parameters

[in]	pFileContext	Information of file to be streamed.
[in]	blockIndex	Block index of incoming data block.
[in]	blockSize	Block size of incoming data block.

Returns

true if successful, false otherwise.

decodeAndStoreDataBlock()

static IngestResult_t decodeAndStoreDataBlock ( OtaFileContext_t *  pFileContext, const uint8_t *  pRawMsg, uint32_t  messageSize, uint8_t **  pPayload, uint32_t *  pBlockSize, uint32_t *  pBlockIndex  )

static

Decode and ingest the incoming data block.

Parameters

[in]	pFileContext	Information of file to be streamed.
[in]	pRawMsg	Raw job document.
[in]	messageSize	Length of document.
[in]	pPayload	Data stored in the document.
[out]	pBlockSize	Block size of incoming data block.
[out]	pBlockIndex	Block index of incoming data block.

Returns

IngestResult_t IngestResultAccepted_Continue if successful, other error for failure.

otaClose()

static bool otaClose ( OtaFileContext_t *const  pFileContext )

static

Close an open OTA file context and free it.

Parameters

[in]

pFileContext

Information of file to be streamed.

Returns

true if successful, false otherwise.

otaTimerCallback()

static void otaTimerCallback ( OtaTimerId_t  otaTimerId )

static

OTA Timer callback.

Parameters

[in]

otaTimerId

Reference to the timer to use.

setImageStateWithReason()

static OtaErr_t setImageStateWithReason ( OtaImageState_t  stateToSet, uint32_t  reasonToSet  )

static

Internal function to set the image state including an optional reason code.

Parameters

[in]	stateToSet	State to set.
[in]	reasonToSet	Reason to set.

Returns

OtaErr_t OtaErrNone if successful, other codes on failure.

updateJobStatusFromImageState()

static OtaErr_t updateJobStatusFromImageState ( OtaImageState_t  state, int32_t  subReason  )

static

Internal function to update the job status to the jobs service from current image state.

Parameters

[in]	state	State to set.
[in]	subReason	Reason for status.

Returns

OtaErr_t OtaErrNone if successful, other codes on failure.

initDocModel()

static DocParseErr_t initDocModel ( JsonDocModel_t *  pDocModel, const JsonDocParam_t *  pBodyDef, void *  contextBaseAddr, uint32_t  contextSize, uint16_t  numJobParams  )

static

Prepare the document model for use by sanity checking the initialization parameters and detecting all required parameters.

Parameters

[in,out]	pDocModel	Details of expected parameters in the job doc.
[in]	pBodyDef	Structure to store the details of keys and where to store them.
[in]	contextBaseAddr	Start of file context.
[in]	contextSize	Size of file context.
[in]	numJobParams	Number of parameters to be extracted.

Returns

DocParseErr_t DocParseErrNone if successful, JSON document parser errors.

initializeAppBuffers()

static void initializeAppBuffers ( OtaAppBuffer_t *  pOtaBuffer )

static

Initialize buffers for storing the file attributes.

Parameters

[out]

pOtaBuffer

OTA Application buffers.

searchTransition()

static uint32_t searchTransition ( const OtaEventMsg_t *  pEventMsg )

static

Search the state transition table for the entry based on current state and incoming event.

Parameters

[in]

pEventMsg

Incoming event information.

Returns

uint32_t Index of the transition.

processValidFileContext()

static OtaErr_t processValidFileContext ( void  )

static

Initiate download if not in self-test else reboot.

Returns

OtaErr_t OtaErrNone if successful.

handleSelfTestJobDoc()

static void handleSelfTestJobDoc ( OtaFileContext_t *  pFileContext )

static

Validate update version when receiving job doc in self test state.

Parameters

[in]

pFileContext

Stores file information.

processNullFileContext()

static OtaErr_t processNullFileContext ( void  )

static

Handle invalid file context.

Returns

OtaErr_t OtaErrNone if job parsing is handled.

platformInSelftest()

static bool platformInSelftest ( void  )

static

Check if the platform is in self-test.

Returns

true if in self-test, else false.

handleUnexpectedEvents()

static void handleUnexpectedEvents ( const OtaEventMsg_t *  pEventMsg )

static

Function to handle events that were unexpected in the current state.

Parameters

[in]

pEventMsg

Stores information of the event.

freeFileContextMem()

static void freeFileContextMem ( OtaFileContext_t *const  pFileContext )

static

Free or clear multiple buffers used in the file context.

Parameters

[in]

pFileContext

Information of file to be streamed.

handleJobParsingError()

static void handleJobParsingError ( const OtaFileContext_t *  pFileContext, OtaJobParseErr_t  err  )

static

Handle job parsing error.

Parameters

[in]	pFileContext	Pointer to the file context.
[in]	err	Parsing error of type OtaJobParseErr_t.

receiveAndProcessOtaEvent()

static void receiveAndProcessOtaEvent ( void  )

static

Receive and process the next available event from the event queue.

Each event is processed based on the behavior defined in the OTA transition table. The state of the OTA state machine will be updated and the corresponding event handler will be called.

startHandler()

static OtaErr_t startHandler ( const OtaEventData_t *  pEventData )

static

Start timers and initiate request for job document.

requestJobHandler()

static OtaErr_t requestJobHandler ( const OtaEventData_t *  pEventData )

static

Initiate a request for a job.

processJobHandler()

static OtaErr_t processJobHandler ( const OtaEventData_t *  pEventData )

static

Update file context from job document.

inSelfTestHandler()

static OtaErr_t inSelfTestHandler ( const OtaEventData_t *  pEventData )

static

Handle self test.

initFileHandler()

static OtaErr_t initFileHandler ( const OtaEventData_t *  pEventData )

static

Initialize and handle file transfer.

processDataHandler()

static OtaErr_t processDataHandler ( const OtaEventData_t *  pEventData )

static

Process incoming data blocks.

requestDataHandler()

static OtaErr_t requestDataHandler ( const OtaEventData_t *  pEventData )

static

Request for data blocks.

shutdownHandler()

static OtaErr_t shutdownHandler ( const OtaEventData_t *  pEventData )

static

Shutdown OTA and cleanup.

closeFileHandler()

static OtaErr_t closeFileHandler ( const OtaEventData_t *  pEventData )

static

Close file opened for download.

userAbortHandler()

static OtaErr_t userAbortHandler ( const OtaEventData_t *  pEventData )

static

Handle user interrupt to abort task.

suspendHandler()

static OtaErr_t suspendHandler ( const OtaEventData_t *  pEventData )

static

Handle suspend event for OTA agent.

resumeHandler()

static OtaErr_t resumeHandler ( const OtaEventData_t *  pEventData )

static

Resume from a suspended state.

jobNotificationHandler()

static OtaErr_t jobNotificationHandler ( const OtaEventData_t *  pEventData )

static

Upon receiving a new job document cancel current job if present and initiate new download.

executeHandler()

static void executeHandler ( uint32_t  index, const OtaEventMsg_t *const  pEventMsg  )

static

Execute the handler for selected index from the transition table.

OTA_EventProcessingTask()

void OTA_EventProcessingTask

(

void *

pUnused

)

OTA agent event processing loop.

This is the main event loop to handle events for OTA update and needs to be called by the application task. This loop will continue to handle and execute events received for OTA Update until this tasks is terminated by the application.

Parameters

[in]

pUnused

Can be used to pass down functionality to the agent task, Unused for now. This can be a function pointer that executes as the first routine when the event loop starts.

For a Posix based reference of creating a thread with this task, please see the demos in AWS IoT Embedded C SDK repository.

OTA_SignalEvent()

bool OTA_SignalEvent

(

const OtaEventMsg_t *const

pEventMsg

)

Signal event to the OTA Agent task.

This function adds the event to the back of event queue and used by internal OTA modules to signal agent task.

Parameters

[in]

pEventMsg

Event to be added to the queue

Returns

true If operation is successful, false If the event can not be added

Example Signal OTA agent that a new file block has been received over the http connection.

OtaHttpStatus_t handleDataFromHTTPService( const HTTPResponse_t * pResponse )
{
    // Assume otaEventBufferGet is a user defined, thread-safe function
    // that gets an available buffer from the pool of OTA buffers.
    OtaEventData_t * pData = otaEventBufferGet();
    OtaHttpStatus_t returnValue = OtaHttpRequestFailed;
    bool result = false;
 
    // Validate pResponse for correct data.
 
    if( pData != NULL )
    {
        memcpy( pData->data, pResponse->pBody, pResponse->bodyLen );
        pData->dataLength = pResponse->bodyLen;
 
        // Send job document received event.
        eventMsg.eventId = OtaAgentEventReceivedFileBlock;
        eventMsg.pEventData = pData;
        result = OTA_SignalEvent( &eventMsg );
 
        if( result )
        {
            returnValue = OtaHttpSuccess;
        }
    }
    return returnValue;
}

OTA_Init()

OtaErr_t OTA_Init	(	OtaAppBuffer_t *	pOtaBuffer,
		OtaInterfaces_t *	pOtaInterfaces,
		const uint8_t *	pThingName,
		OtaAppCallback_t	OtaAppCallback
	)

OTA Agent initialization function.

Initialize the OTA engine by starting the OTA Agent ("OTA Task") in the system. This function must be called with the connection client context before calling OTA_CheckForUpdate. Only one OTA Agent may exist.

Parameters

[in]	pOtaBuffer	Buffers used by the agent to store different params.
[in]	pOtaInterfaces	A pointer to the OS context.
[in]	pThingName	A pointer to a C string holding the Thing name.
[in]	OtaAppCallback	Static callback function for when an OTA job is complete. This function will have input of the state of the OTA image after download and during self-test.

Returns

OtaErr_t The state of the OTA Agent upon return from the OtaState_t enum. If the agent was successfully initialized and ready to operate, the state will be OtaAgentStateReady. Otherwise, it will be one of the other OtaState_t enum values.

Example

// Application callback when the OTA agent has completed the job
// or is in self test mode. For example see [demos](https://github.com/aws/aws-iot-device-sdk-embedded-C/tree/main/demos/ota)
void otaAppCallback( OtaJobEvent_t event,
                     const void * pData );
 
// Optional: User buffer to pass down to the OTA Agent. These
// buffers are assumed to be initialized previously, example:
// uint8_t updateFilePath[ OTA_MAX_FILE_PATH_SIZE ];
OtaAppBuffer_t otaBuffer =
{
    .pUpdateFilePath    = updateFilePath,
    .updateFilePathsize = OTA_MAX_FILE_PATH_SIZE,
    .pCertFilePath      = certFilePath,
    .certFilePathSize   = OTA_MAX_FILE_PATH_SIZE,
    .pDecodeMemory      = decodeMem,
    .decodeMemorySize   = otaconfigFILE_BLOCK_SIZE,
    .pFileBitmap        = bitmap,
    .fileBitmapSize     = OTA_MAX_BLOCK_BITMAP_SIZE,
    .pUrl               = updateUrl,
    .urlSize            = OTA_MAX_URL_SIZE,
    .pAuthScheme        = authScheme,
    .authSchemeSize     = OTA_MAX_AUTH_SCHEME_SIZE
};
 
// OTA interface context required for library interface functions
// The functions set by these interfaces are assumed to be defined
// For more information see [demos](https://github.com/aws/aws-iot-device-sdk-embedded-C/tree/main/demos/ota)
OtaInterfaces_t pOtaInterfaces =
{
    // Initialize OTA library OS Interface.
    .os.event.init = Posix_OtaInitEvent;
    .os.event.send = Posix_OtaSendEvent;
    ...
    // Initialize the OTA library MQTT Interface.
    .mqtt.subscribe = mqttSubscribe;
    .mqtt.publish = mqttPublish;
    .mqtt.unsubscribe = mqttUnsubscribe;
    // Initialize the OTA library HTTP Interface.
    .http.init = httpInit;
    .http.request = httpRequest;
    .http.deinit = httpDeinit;
    // Initialize the OTA library PAL Interface.
    .pal.getPlatformImageState = otaPal_GetPlatformImageState;
    .pal.setPlatformImageState = otaPal_SetPlatformImageState;
}
 
// OTA library error status.
OtaErr_t otaErr = OtaErrNone;
 
// Unique client identifier
char * pClientIdentifier = "uniqueClientID";
 
otaErr = OTA_Init( &otaBuffer,
                   &otaInterfaces,
                   ( const uint8_t * ) pClientIdentifier,
                   otaAppCallback ) ) != OtaErrNone )
         if( otaErr == OtaErrNone )
{
    // Do something with the OTA agent.
}

OTA_Shutdown()

OtaState_t OTA_Shutdown	(	uint32_t	ticksToWait,
		uint8_t	unsubscribeFlag
	)

Signal to the OTA Agent to shut down.

Signals the OTA agent task to shut down. The OTA agent will unsubscribe from all MQTT job notification topics, stop in progress OTA jobs, if any, and clear all resources.

Parameters

[in]	ticksToWait	The number of ticks to wait for the OTA Agent to complete the shutdown process. If this is set to zero, the function will return immediately without waiting. The actual state is returned to the caller. The agent does not sleep for this while but used for busy looping.
[in]	unsubscribeFlag	Flag to indicate if unsubscribe operations should be performed from the job topics when shutdown is called. If the flag is 0 then unsubscribe operations are not called for job topics If application requires it to be unsubscribed from the job topics then flag must be set to 1 when calling OTA_Shutdown.

Returns

One of the OTA agent states from the OtaState_t enum. A normal shutdown will return OtaAgentStateNotReady. Otherwise, refer to the OtaState_t enum for details.

Example

// ticksToWait used for busy looping until shutdown. Actual delay may depend on the agent priority,
// and platform.
uint32_t ticksToWait = 100;
 
// If it is required that the unsubscribe operations are not
//performed while shutting down set this to 0.
uint8_t unsubscribe = 1;
 
OTA_Shutdown(ticksToWait, unsubscribe);
...
 
if( OTA_GetState() != OtaAgentStateStopped )
{
    // Optional: Disconnect MQTT and HTTP connections
    // required by the OTA agent and other tasks.
}

OTA_GetState()

OtaState_t OTA_GetState

(

void

)

Get the current state of the OTA agent.

Returns

The current state of the OTA agent.

Example Check if OTA agent is in suspended state.

// OTA Agent state
OtaState_t state = OTA_GetState();
 
while( state != OtaAgentStateSuspended )
{
    // Do something while the agent is back to
    // the desired state.
    state = OTA_GetState();
}

OTA_GetStatistics()

OtaErr_t OTA_GetStatistics

(

OtaAgentStatistics_t *

pStatistics

)

Get the statistics of OTA message packets.

Packet statistics are:

• Received: The number of OTA packets that have been received but not necessarily queued for processing by the OTA agent.
• Queued: The number of OTA packets that have been queued for processing. This implies there was a free message queue entry so it can be passed to the agent for processing.
• Processed: The number of OTA packets that have actually been processed.
• Dropped: The number of OTA packets that have been dropped because of either no queue or at shutdown cleanup.

Note

Calling OTA_Init will reset this statistic.

Returns

OtaErrNone if the statistics can be received successfully.

Example

// OTA library packet statistics per job.
OtaAgentStatistics_t otaStatistics = { 0 };
OtaErr_t otaErr = OtaErrNone;
 
// Get the current statistics from the agent.
otaErr = OTA_GetStatistics( &otaStatistics );
 
if( otaErr != OtaErrNone )
{
    printf( " Received: %u   Queued: %u   Processed: %u   Dropped: %u",
            otaStatistics.otaPacketsReceived,
            otaStatistics.otaPacketsQueued,
            otaStatistics.otaPacketsProcessed,
            otaStatistics.otaPacketsDropped );
}

OTA_CheckForUpdate()

OtaErr_t OTA_CheckForUpdate

(

void

)

Request for the next available OTA job from the job service.

Returns

OtaErrNone if successful, otherwise an error code prefixed with 'OtaErr' from the list above.

OTA_ActivateNewImage()

OtaErr_t OTA_ActivateNewImage

(

void

)

Activate the newest MCU image received via OTA.

This function should reset the MCU and cause a reboot of the system to execute the newly updated firmware. It should be called by the user code sometime after the OtaJobEventActivate event is passed to the users application via the OTA Job Complete Callback mechanism. Refer to the OTA_Init function for more information about configuring the callback.

Returns

OtaErrNone if successful, otherwise an error code prefixed with 'OtaErr' from the list above.

Example

static void otaAppCallback( OtaJobEvent_t event,
                            const void * pData )
{
    OtaErr_t otaErr = OtaErrNone;
    if( event == OtaJobEventActivate )
    {
        // Activate the new firmware image.
        // This calls the platform specific code required to
        // activate the received OTA update firmware.
        otaErr = OTA_ActivateNewImage();
        if( otaErr == OtaErrActivateFailed )
        {
             // Handle Image activation failure by requesting manual response, sending
             // error logs or retrying activation.
        }
    }
 
    // Handle other events
}

OTA_SetImageState()

OtaErr_t OTA_SetImageState

(

OtaImageState_t

state

)

Set the state of the current MCU image.

The states are OtaImageStateTesting, OtaImageStateAccepted, OtaImageStateAborted or OtaImageStateRejected; see OtaImageState_t documentation. This will update the status of the current image and publish to the active job status topic.

Parameters

[in]

state

The state to set of the OTA image.

Returns

OtaErrNone if successful, otherwise an error code prefixed with 'OtaErr' from the list above.

Example Set image state to reflect new image is accepted in application callback.

static void otaAppCallback( OtaJobEvent_t event,
                            const void * pData )
{
    OtaErr_t otaErr = OtaErrNone;
 
    if( event == OtaJobEventStartTest )
    {
        err = OTA_SetImageState( OtaImageStateAccepted );
        if( err != OtaErrNone )
        {
            // Handle failure or retry setting the image state.
        }
    }
 
    // Handle other events
}

OTA_GetImageState()

OtaImageState_t OTA_GetImageState

(

void

)

Get the state of the currently running MCU image.

The states are OtaImageStateTesting, OtaImageStateAccepted, OtaImageStateAborted or OtaImageStateRejected; see OtaImageState_t documentation.

Returns

The state of the current context's OTA image.

OTA_Suspend()

OtaErr_t OTA_Suspend

(

void

)

Suspend OTA agent operations .

Returns

OtaErrNone if successful, otherwise an error code prefixed with 'OtaErr' from the list above.

Example Suspend the OTA agent when a network error occurs.

void handleNetworkErrors()
{
    OtaErr_t otaErr = OtaErrNone;
    int16_t suspendTimeout = 5000U;
 
    // Handle disconnects and other network reset operations
 
    // Suspend OTA operations.
    otaErr = OTA_Suspend();
 
    if( otaErr != OtaErrNone )
    {
        // Suspend may fail due to Event queue failure,
        // or if the agent has shut down, handle the failure by
        // sending logs or retrying OTA_Suspend().
    }
    else
    {
        while( ( ( OTA_GetState() != OtaAgentStateSuspended )
                && ( suspendTimeout > 0 ) )
        {
            // Wait for OTA Library state to suspend
            portSleep( 1000U );
            suspendTimeout -= 1000U;
        }
        if( OTA_GetState() != OtaAgentStateSuspended )
        {
            // Handle Suspend failure or Retry OTA_Suspend().
        }
    }
}

OTA_Resume()

OtaErr_t OTA_Resume

(

void

)

Resume OTA agent operations .

Returns

OtaErrNone if successful, otherwise an error code prefixed with 'OtaErr' from the list above.

Example Resume the OTA agent after the network errors are resolved.

bool handleReconnect()
{
    // OTA event message used for sending event to OTA Agent.
    OtaEventMsg_t eventMsg = { 0 };
    OtaErr_t otaErr = OtaErrUninitialized;
    bool returnStatus = establishConnection();
 
    if( returnStatus == EXIT_SUCCESS )
    {
        // Check if OTA process was suspended and resume if required.
        if( OTA_GetState() == OtaAgentStateSuspended )
        {
            // Resume OTA operations.
            otaErr = OTA_Resume();
        }
        else
        {
            // Send start event to OTA Agent.
            eventMsg.eventId = OtaAgentEventStart;
            OTA_SignalEvent( &eventMsg );
        }
 
        if( otaErr != OtaErrNone )
            returnStatus = false;
    }
 
    return returnStatus;
}

OTA_Err_strerror()

const char* OTA_Err_strerror

(

OtaErr_t

err

)

Error code to string conversion for OTA errors.

Parameters

[in]

err

The error to convert to a string.

Returns

The string representation of the error.

OTA_JobParse_strerror()

const char* OTA_JobParse_strerror

(

OtaJobParseErr_t

err

)

Error code to string conversion for OTA Job Parsing errors.

Parameters

[in]

err

The error to convert to a string.

Returns

The string representation of the error.

OTA_OsStatus_strerror()

const char* OTA_OsStatus_strerror

(

OtaOsStatus_t

status

)

Status code to string conversion for OTA OS status.

Parameters

[in]

status

The status to convert to a string.

Returns

The string representation of the status.

OTA_PalStatus_strerror()

const char* OTA_PalStatus_strerror

(

OtaPalMainStatus_t

status

)

Status code to string conversion for OTA PAL status.

Parameters

[in]

status

The status to convert to a string.

Returns

The string representation of the status.

Variable Documentation

otaAgent

OtaAgentContext_t otaAgent

static

Initial value:

=
{
    OtaAgentStateStopped, 
    { 0 },                
    { 0 },                
    0,                    
    0,                    
    { 0 },                
    NULL,                 
    0,                    
    OtaImageStateUnknown, 
    1,                    
    { 0 },                
    0,                    
    NULL,                 
    NULL,                 
    1                     
}

This is THE OTA agent context and initialization state.

otaTransitionTable

OtaStateTableEntry_t otaTransitionTable[]

static

Initial value:

=
{
    
    { OtaAgentStateReady,               OtaAgentEventStart,               startHandler,           OtaAgentStateRequestingJob       },
    { OtaAgentStateRequestingJob,       OtaAgentEventRequestJobDocument,  requestJobHandler,      OtaAgentStateWaitingForJob       },
    { OtaAgentStateRequestingJob,       OtaAgentEventRequestTimer,        requestJobHandler,      OtaAgentStateWaitingForJob       },
    { OtaAgentStateWaitingForJob,       OtaAgentEventReceivedJobDocument, processJobHandler,      OtaAgentStateCreatingFile        },
    { OtaAgentStateCreatingFile,        OtaAgentEventStartSelfTest,       inSelfTestHandler,      OtaAgentStateWaitingForJob       },
    { OtaAgentStateCreatingFile,        OtaAgentEventCreateFile,          initFileHandler,        OtaAgentStateRequestingFileBlock },
    { OtaAgentStateCreatingFile,        OtaAgentEventRequestTimer,        initFileHandler,        OtaAgentStateRequestingFileBlock },
    { OtaAgentStateRequestingFileBlock, OtaAgentEventRequestFileBlock,    requestDataHandler,     OtaAgentStateWaitingForFileBlock },
    { OtaAgentStateRequestingFileBlock, OtaAgentEventRequestTimer,        requestDataHandler,     OtaAgentStateWaitingForFileBlock },
    { OtaAgentStateWaitingForFileBlock, OtaAgentEventReceivedFileBlock,   processDataHandler,     OtaAgentStateWaitingForFileBlock },
    { OtaAgentStateWaitingForFileBlock, OtaAgentEventRequestTimer,        requestDataHandler,     OtaAgentStateWaitingForFileBlock },
    { OtaAgentStateWaitingForFileBlock, OtaAgentEventRequestFileBlock,    requestDataHandler,     OtaAgentStateWaitingForFileBlock },
    { OtaAgentStateWaitingForFileBlock, OtaAgentEventRequestJobDocument,  requestJobHandler,      OtaAgentStateWaitingForJob       },
    { OtaAgentStateWaitingForFileBlock, OtaAgentEventReceivedJobDocument, jobNotificationHandler, OtaAgentStateRequestingJob       },
    { OtaAgentStateWaitingForFileBlock, OtaAgentEventCloseFile,           closeFileHandler,       OtaAgentStateWaitingForJob       },
    { OtaAgentStateSuspended,           OtaAgentEventResume,              resumeHandler,          OtaAgentStateRequestingJob       },
    { OtaAgentStateAll,                 OtaAgentEventSuspend,             suspendHandler,         OtaAgentStateSuspended           },
    { OtaAgentStateAll,                 OtaAgentEventUserAbort,           userAbortHandler,       OtaAgentStateWaitingForJob       },
    { OtaAgentStateAll,                 OtaAgentEventShutdown,            shutdownHandler,        OtaAgentStateStopped             },
}

Transition table for the OTA state machine.

pOtaAgentStateStrings

const char* pOtaAgentStateStrings[OtaAgentStateAll+1]

static

Initial value:

=
{
    "Init",
    "Ready",
    "RequestingJob",
    "WaitingForJob",
    "CreatingFile",
    "RequestingFileBlock",
    "WaitingForFileBlock",
    "ClosingFile",
    "Suspended",
    "ShuttingDown",
    "Stopped",
    "All"
}

< String set to represent the States of the OTA agent.

pOtaEventStrings

const char* pOtaEventStrings[OtaAgentEventMax]

static

Initial value:

=
{
    "Start",
    "StartSelfTest",
    "RequestJobDocument",
    "ReceivedJobDocument",
    "CreateFile",
    "RequestFileBlock",
    "ReceivedFileBlock",
    "RequestTimer",
    "CloseFile",
    "Suspend",
    "Resume",
    "UserAbort",
    "Shutdown"
}

< String set to represent the Events for the OTA agent.

otaJobDocModelParamStructure

const JsonDocParam_t otaJobDocModelParamStructure[OTA_NUM_JOB_PARAMS]

static

Initial value:

=
{
    { OTA_JSON_CLIENT_TOKEN_KEY,    OTA_JOB_PARAM_OPTIONAL, OTA_DONT_STORE_PARAM,         OTA_DONT_STORE_PARAM,  ModelParamTypeStringInDoc },
    { OTA_JSON_TIMESTAMP_KEY,       OTA_JOB_PARAM_OPTIONAL, OTA_DONT_STORE_PARAM,         OTA_DONT_STORE_PARAM,  ModelParamTypeUInt32      },
    { OTA_JSON_EXECUTION_KEY,       OTA_JOB_PARAM_REQUIRED, OTA_DONT_STORE_PARAM,         OTA_DONT_STORE_PARAM,  ModelParamTypeObject      },
    { OTA_JSON_JOB_ID_KEY,          OTA_JOB_PARAM_REQUIRED, U16_OFFSET( OtaFileContext_t, pJobName ),            U16_OFFSET( OtaFileContext_t, jobNameMaxSize ), ModelParamTypeStringCopy},
    { OTA_JSON_STATUS_DETAILS_KEY,  OTA_JOB_PARAM_OPTIONAL, OTA_DONT_STORE_PARAM,         OTA_DONT_STORE_PARAM,  ModelParamTypeObject      },
    { OTA_JSON_SELF_TEST_KEY,       OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, isInSelfTest ),        OTA_DONT_STORE_PARAM, ModelParamTypeIdent},
    { OTA_JSON_UPDATED_BY_KEY,      OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, updaterVersion ),      OTA_DONT_STORE_PARAM, ModelParamTypeUInt32},
    { OTA_JSON_JOB_DOC_KEY,         OTA_JOB_PARAM_REQUIRED, OTA_DONT_STORE_PARAM,         OTA_DONT_STORE_PARAM,  ModelParamTypeObject      },
    { OTA_JSON_OTA_UNIT_KEY,        OTA_JOB_PARAM_REQUIRED, OTA_DONT_STORE_PARAM,         OTA_DONT_STORE_PARAM,  ModelParamTypeObject      },
    { OTA_JSON_STREAM_NAME_KEY,     OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, pStreamName ),         U16_OFFSET( OtaFileContext_t, streamNameMaxSize ), ModelParamTypeStringCopy},
    { OTA_JSON_PROTOCOLS_KEY,       OTA_JOB_PARAM_REQUIRED, U16_OFFSET( OtaFileContext_t, pProtocols ),          U16_OFFSET( OtaFileContext_t, protocolMaxSize ), ModelParamTypeArrayCopy},
    { OTA_JSON_FILE_GROUP_KEY,      OTA_JOB_PARAM_REQUIRED, OTA_STORE_NESTED_JSON,        OTA_STORE_NESTED_JSON, ModelParamTypeArray       },
    { OTA_JSON_FILE_PATH_KEY,       OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, pFilePath ),           U16_OFFSET( OtaFileContext_t, filePathMaxSize ), ModelParamTypeStringCopy},
    { OTA_JSON_FILE_SIZE_KEY,       OTA_JOB_PARAM_REQUIRED, U16_OFFSET( OtaFileContext_t, fileSize ),            OTA_DONT_STORE_PARAM, ModelParamTypeUInt32},
    { OTA_JSON_FILE_ID_KEY,         OTA_JOB_PARAM_REQUIRED, U16_OFFSET( OtaFileContext_t, serverFileID ),        OTA_DONT_STORE_PARAM, ModelParamTypeUInt32},
    { OTA_JSON_FILE_CERT_NAME_KEY,  OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, pCertFilepath ),       U16_OFFSET( OtaFileContext_t, certFilePathMaxSize ), ModelParamTypeStringCopy},
    { OTA_JSON_UPDATE_DATA_URL_KEY, OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, pUpdateUrlPath ),      U16_OFFSET( OtaFileContext_t, updateUrlMaxSize ), ModelParamTypeStringCopy},
    { OTA_JSON_AUTH_SCHEME_KEY,     OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, pAuthScheme ),         U16_OFFSET( OtaFileContext_t, authSchemeMaxSize ), ModelParamTypeStringCopy},
    { OTA_JsonFileSignatureKey,     OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, pSignature ),          OTA_DONT_STORE_PARAM, ModelParamTypeSigBase64},
    { OTA_JSON_FILE_ATTRIBUTE_KEY,  OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, fileAttributes ),      OTA_DONT_STORE_PARAM, ModelParamTypeUInt32},
    { OTA_JSON_FILETYPE_KEY,        OTA_JOB_PARAM_OPTIONAL, U16_OFFSET( OtaFileContext_t, fileType ),            OTA_DONT_STORE_PARAM, ModelParamTypeUInt32}
}

This is the OTA job document model describing the parameters, their types, destination and how to extract.

pJobNameBuffer

uint8_t pJobNameBuffer[OTA_JOB_ID_MAX_SIZE]

static

Buffer to store job name.

pProtocolBuffer

uint8_t pProtocolBuffer[OTA_PROTOCOL_BUFFER_SIZE]

static

Buffer to store data protocol.

sig256Buffer

Sig256_t sig256Buffer

static

Buffer to store key file signature.