本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。
Over-the-air 更新演示應用
FreeRTOS 包含一個演示應用程序，演示了 over-the-air（OTA）庫的功能。OTA 演示應用程序位於freertos/demos/ota/ota_demo_core_mqtt/ota_demo_core_mqtt.cfreertos/demos/ota/ota_demo_core_http/ota_demo_core_http.c
OTA 示範應用程式可執行下列作業：
-
初始化 FreeRTOS 網路堆疊和 MQTT 緩衝集區。
-
使用創建一個任務來練習 OTA 庫
vRunOTAUpdateDemo()。 -
使用
_establishMqttConnection()建立 MQTT 用戶端。 -
使用連接到AWS IoT MQTT 代理商，
IotMqtt_Connect()並註冊 MQTT 斷開回調：prvNetworkDisconnectCallback。 -
呼叫
OTA_AgentInit()來建立 OTA 任務，並註冊在 OTA 任務完成時使用的回呼。 -
重複使用 MQTT 連接
xOTAConnectionCtx.pvControlClient = _mqttConnection; -
如果 MQTT 斷開連接，應用程序將暫停 OTA 代理程序，嘗試使用帶抖動的指數延遲重新連接，然後恢復 OTA 代理程序。
在使用 OTA 更新之前，請先完成中的所有先決條件空中免費更新
完成 OTA 更新的設置後，在支持 OTA 功能的平台上下載，構建，刷新和運行 FreeRTOS OTA 演示。特定於裝置的示範指示可用於下列免費使用者資格的裝置：
在您的裝置上建置、更新並執行 OTA 示範應用程式之後，您可以使用 AWS IoT 主控台或 AWS CLI 建立 OTA 更新任務。在您建立 OTA 更新任務後，請連線終端機模擬器，以查看 OTA 的進度更新。請記下程序中產生的任何錯誤。
成功的 OTA 更新任務，會顯示如下所示的輸出。為簡潔起見，此範例中的某些行已從清單中移除。
249 21207 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 0 Queued: 0 Processed: 0 Dropped: 0 250 21247 [MQTT Agent Task] [core_mqtt.c:886] [INFO] [MQTT] Packet received. ReceivedBytes=601. 251 21247 [MQTT Agent Task] [core_mqtt.c:1045] [INFO] [MQTT] De-serialized incoming PUBLISH packet: DeserializerResult=MQTTSuccess. 252 21248 [MQTT Agent Task] [core_mqtt.c:1058] [INFO] [MQTT] State record updated. New state=MQTTPubAckSend. 253 21249 [MQTT Agent Task] [ota_demo_core_mqtt.c:976] [INFO] [MQTT] Received job message callback, size 548. 254 21252 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[execution.jobId: AFR_OTA-9702f1a3-b747-4c3e-a0eb-a3b0cf83ddbb] 255 21253 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[execution.jobDocument.afr_ota.streamname: AFR_OTA-945d320b-a18b-441b-b435-4a18d4e7671f] 256 21255 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[execution.jobDocument.afr_ota.protocols: ["MQTT"]] 257 21256 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[filepath: aws_demos.bin] 258 21257 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[filesize: 1164016] 259 21258 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[fileid: 0] 260 21259 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[certfile: ecdsa-sha256-signer.crt.pem] 261 21260 [OTA Agent Task] [ota.c:1575] [INFO] [OTA] Extracted parameter [ sig-sha256-ecdsa: MEQCIE1SFkIHHiZAvkPpu6McJtx7SYoD... ] 262 21261 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[fileType: 0] 263 21262 [OTA Agent Task] [ota.c:2199] [INFO] [OTA] Job document was accepted. Attempting to begin the update. 264 21263 [OTA Agent Task] [ota.c:2323] [INFO] [OTA] Job parsing success: OtaJobParseErr_t=OtaJobParseErrNone, Job name=AFR_OTA-9702f1a3-b747-4c3e-a0eb-a3b0cf83ddbb 265 21318 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 0 Queued: 0 Processed: 0 Dropped: 0 266 21418 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 0 Queued: 0 Processed: 0 Dropped: 0 267 21469 [OTA Agent Task] [ota.c:938] [INFO] [OTA] Setting OTA data interface. 268 21470 [OTA Agent Task] [ota.c:2839] [INFO] [OTA] Current State=[CreatingFile], Event=[ReceivedJobDocument], New state=[CreatingFile] 269 21482 [MQTT Agent Task] [core_mqtt.c:886] [INFO] [MQTT] Packet received. ReceivedBytes=3. 270 21483 [OTA Agent Task] [ota_demo_core_mqtt.c:1503] [INFO] [MQTT] SUBSCRIBED to topic $aws/things/__test_infra_thing71/streams/AFR_OTA-945d320b-a18b-441b-b435-4a18d4e7671f/data/cbor to bro 271 21484 [OTA Agent Task] [ota.c:2839] [INFO] [OTA] Current State=[RequestingFileBlock], Event=[CreateFile], New state=[RequestingFileBlock] 272 21518 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 0 Queued: 0 Processed: 0 Dropped: 0 273 21532 [MQTT Agent Task] [core_mqtt_agent_command_functions.c:76] [INFO] [MQTT] Publishing message to $aws/things/__test_infra_thing71/streams/AFR_OTA-945d320b-a18b-441b-b435-4a18d4e7671f/ 274 21534 [OTA Agent Task] [ota_demo_core_mqtt.c:1553] [INFO] [MQTT] Sent PUBLISH packet to broker $aws/things/__test_infra_thing71/streams/AFR_OTA-945d320b-a18b-441b-b435-4a18d4e7671f/get/cbor 275 21534 [OTA Agent Task] [ota_mqtt.c:1112] [INFO] [OTA] Published to MQTT topic to request the next block: topic=$aws/things/__test_infra_thing71/streams/AFR_OTA-945d320b-a18b-441b-b435-4a1 276 21537 [OTA Agent Task] [ota.c:2839] [INFO] [OTA] Current State=[WaitingForFileBlock], Event=[RequestFileBlock], New state=[WaitingForFileBlock] 277 21558 [MQTT Agent Task] [core_mqtt.c:886] [INFO] [MQTT] Packet received. ReceivedBytes=4217. 278 21559 [MQTT Agent Task] [core_mqtt.c:1045] [INFO] [MQTT] De-serialized incoming PUBLISH packet: DeserializerResult=MQTTSuccess. 279 21560 [MQTT Agent Task] [core_mqtt.c:1058] [INFO] [MQTT] State record updated. New state=MQTTPublishDone. 280 21561 [MQTT Agent Task] [ota_demo_core_mqtt.c:1026] [INFO] [MQTT] Received data message callback, size 4120. 281 21563 [OTA Agent Task] [ota.c:2464] [INFO] [OTA] Received valid file block: Block index=0, Size=4096 282 21566 [OTA Agent Task] [ota.c:2683] [INFO] [OTA] Number of blocks remaining: 284 ... // Output removed for brevity 3672 42745 [OTA Agent Task] [ota.c:2464] [INFO] [OTA] Received valid file block: Block index=284, Size=752 3673 42747 [OTA Agent Task] [ota.c:2633] [INFO] [OTA] Received final block of the update. (428298) ota_pal: No such certificate file: ecdsa-sha256-signer.crt.pem. Using certificate in ota_demo_config.h. 3674 42818 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 285 Queued: 285 Processed: 284 Dropped: 0 3675 42918 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 285 Queued: 285 Processed: 284 Dropped: 0 ... // Output removed for brevity 3678 43197 [OTA Agent Task] [ota.c:2654] [INFO] [OTA] Received entire update and validated the signature. 3685 43215 [OTA Agent Task] [ota_demo_core_mqtt.c:862] [INFO] [MQTT] Received OtaJobEventActivate callback from OTA Agent. ... // Output removed for brevity 2 39 [iot_thread] [INFO ][DEMO][390] ---------STARTING DEMO--------- [0;32mI (3633) WIFI: WIFI_EVENT_STA_CONNECTED [0;32mI (4373) WIFI: SYSTEM_EVENT_STA_GOT_IP ... // Output removed for brevity 4 351 [sys_evt] [INFO ][DEMO][3510] Connected to WiFi access point, ip address: 255.255.255.0. 5 351 [iot_thread] [INFO ][DEMO][3510] Successfully initialized the demo. Network type for the demo: 1 6 351 [iot_thread] [ota_demo_core_mqtt.c:1902] [INFO] [MQTT] OTA over MQTT demo, Application version 0.9.1 7 351 [iot_thread] [ota_demo_core_mqtt.c:1323] [INFO] [MQTT] Creating a TLS connection to <endpoint>-ats.iot.us-west-2.amazonaws.com:8883. 9 718 [iot_thread] [core_mqtt.c:886] [INFO] [MQTT] Packet received. ReceivedBytes=2. 10 718 [iot_thread] [core_mqtt_serializer.c:970] [INFO] [MQTT] CONNACK session present bit not set. 11 718 [iot_thread] [core_mqtt_serializer.c:912] [INFO] [MQTT] Connection accepted. ... // Output removed for brevity 17 736 [OTA Agent Task] [ota_demo_core_mqtt.c:1503] [INFO] [MQTT] SUBSCRIBED to topic $aws/things/__test_infra_thing71/jobs/notify-next to broker. 18 737 [OTA Agent Task] [ota_mqtt.c:381] [INFO] [OTA] Subscribed to MQTT topic: $aws/things/__test_infra_thing71/jobs/notify-next 30 818 [iot_thread] [ota_demo_core_mqtt.c:1850] [INFO] [MQTT] Received: 0 Queued: 0 Processed: 0 Dropped: 0 31 819 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[execution.jobId: AFR_OTA-9702f1a3-b747-4c3e-a0eb-a3b0cf83ddbb] 32 820 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[execution.statusDetails.updatedBy: 589824] 33 822 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[execution.jobDocument.afr_ota.streamname: AFR_OTA-945d320b-a18b-441b-b435-4a18d4e7671f] 34 823 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[execution.jobDocument.afr_ota.protocols: ["MQTT"]] 35 824 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[filepath: aws_demos.bin] 36 825 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[filesize: 1164016] 37 826 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[fileid: 0] 38 827 [OTA Agent Task] [ota.c:1645] [INFO] [OTA] Extracted parameter: [key: value]=[certfile: ecdsa-sha256-signer.crt.pem] 39 828 [OTA Agent Task] [ota.c:1575] [INFO] [OTA] Extracted parameter [ sig-sha256-ecdsa: MEQCIE1SFkIHHiZAvkPpu6McJtx7SYoD... ] 40 829 [OTA Agent Task] [ota.c:1684] [INFO] [OTA] Extracted parameter: [key: value]=[fileType: 0] 41 830 [OTA Agent Task] [ota.c:2102] [INFO] [OTA] In self test mode. 42 830 [OTA Agent Task] [ota.c:1936] [INFO] [OTA] New image has a higher version number than the current image: New image version=0.9.1, Previous image version=0.9.0 43 832 [OTA Agent Task] [ota.c:2120] [INFO] [OTA] Image version is valid: Begin testing file: File ID=0 53 896 [OTA Agent Task] [ota.c:794] [INFO] [OTA] Beginning self-test. 62 971 [OTA Agent Task] [ota_demo_core_mqtt.c:1553] [INFO] [MQTT] Sent PUBLISH packet to broker $aws/things/__test_infra_thing71/jobs/AFR_OTA-9702f1a3-b747-4c3e-a0eb-a3b0cf83ddbb/update to br63 971 [MQTT Agent Task] [core_mqtt.c:1045] [INFO] [MQTT] De-serialized incoming PUBLISH packet: DeserializerResult=MQTTSuccess. 65 973 [MQTT Agent Task] [core_mqtt.c:1058] [INFO] [MQTT] State record updated. New state=MQTTPublishDone. 64 973 [OTA Agent Task] [ota_demo_core_mqtt.c:902] [INFO] [MQTT] Successfully updated with the new image.
