MQTT协议下载仅含单个升级文件的升级包的OTA例程运行后，您可以在设备端和物联网平台查看日志信息。
前提条件
已配置OTA升级例程./demos/mota_basic_demo.c，详细信息，请参见示例代码说明。
设备端日志
您可以在设备端查看运行结果。连接日志：
出现如下日志，表示设备与物联网平台连接成功。[1635150280.422][LK-0313] MQTT user calls aiot_mqtt_connect api, connect [1635150280.422][LK-032A] mqtt host: iot-******.iot-as-mqtt.unify.aliyuncs.com [1635150280.422][LK-0317] user name: LightSwitch&/a18wP****** [1635150280.422][LK-0318] password: A5C6EBEFDE263E8A473C10E3F03CCAE069E56E8F6AC1081BAE628BA2D0****** success to establish tcp, fd=3 local port: 32826 [1635150280.433][LK-1000] establish mbedtls connection with server(host='iot-******.iot-as-mqtt.unify.aliyuncs.com', port=[1883]) [1635150280.499][LK-1000] success to establish mbedtls connection, (cost 45250 bytes in total, max used 47986 bytes) [1635150280.633][LK-0313] MQTT connect success in 210 ms AIOT_MQTTEVT_CONNECT上报版本号日志：
以下日志显示设备上报了初始的设备版本号1.0.0。[1579511737.522][LK-0309] pub: /ota/device/inform/a18wP******/LightSwitch [LK-030A] > 7B 22 69 64 22 3A 30 2C 20 22 70 61 72 61 6D 73 | {"id":0, "params [LK-030A] > 22 3A 7B 22 76 65 72 73 69 6F 6E 22 3A 22 31 2E | ":{"version":"1. [LK-030A] > 30 2E 30 22 7D 7D | 0.0"}}接收OTA升级指令的日志：
在物联网平台创建OTA升级任务，并添加仅含单个文件的升级包后，设备接收以下OTA指令消息。[1635150286.199][LK-0309] pub: /ota/device/upgrade/a18wP******/LightSwitch [LK-030A] < 7B 22 63 6F 64 65 22 3A 22 31 30 30 30 22 2C 22 | {"code":"1000"," [LK-030A] < 64 61 74 61 22 3A 7B 22 73 69 7A 65 22 3A 35 37 | data":{"size":57 [LK-030A] < 33 34 2C 22 73 74 72 65 61 6D 49 64 22 3A 39 30 | 34,"streamId":90 [LK-030A] < 2C 22 73 69 67 6E 22 3A 22 63 37 38 63 65 33 33 | ,"sign":"c78ce33 [LK-030A] < 62 62 63 64 39 30 31 35 30 36 37 65 33 61 61 38 | bbcd9015067e3aa8 [LK-030A] < 61 64 34 64 63 31 30 39 31 22 2C 22 64 50 72 6F | ad4******","dPro [LK-030A] < 74 6F 63 6F 6C 22 3A 22 6D 71 74 74 22 2C 22 76 | tocol":"mqtt","v [LK-030A] < 65 72 73 69 6F 6E 22 3A 22 34 2E 32 2E 30 22 2C | ersion":"4.2.0", [LK-030A] < 22 73 69 67 6E 4D 65 74 68 6F 64 22 3A 22 4D 64 | "signMethod":"Md [LK-030A] < 35 22 2C 22 73 74 72 65 61 6D 46 69 6C 65 49 64 | 5","streamFileId [LK-030A] < 22 3A 31 2C 22 6D 64 35 22 3A 22 63 37 38 63 65 | ":1,"md5":"c78ce [LK-030A] < 33 33 62 62 63 64 39 30 31 35 30 36 37 65 33 61 | 33bbcd9015067e3a [LK-030A] < 61 38 61 64 34 64 63 31 30 39 31 22 7D 2C 22 69 | a8ad4******"},"i [LK-030A] < 64 22 3A 31 36 33 35 31 35 30 32 38 36 31 38 37 | d":1635150****** [LK-030A] < 2C 22 6D 65 73 73 61 67 65 22 3A 22 73 75 63 63 | ,"message":"succ [LK-030A] < 65 73 73 22 7D | ess"}- 发送获取升级文件的日志：
[1635150286.199][LK-0309] pub: /sys/a18wP******/LightSwitch/thing/file/download [LK-030A] > 7B 22 69 64 22 3A 22 31 22 2C 22 76 65 72 73 69 | {"id":"1","versi [LK-030A] > 6F 6E 22 3A 22 31 2E 30 22 2C 22 70 61 72 61 6D | on":"1.0","param [LK-030A] > 73 22 3A 7B 22 66 69 6C 65 54 6F 6B 65 6E 22 3A | s":{"fileToken": [LK-030A] > 22 64 65 66 61 75 6C 74 22 2C 22 66 69 6C 65 49 | "default","fileI [LK-030A] > 6E 66 6F 22 3A 7B 22 73 74 72 65 61 6D 49 64 22 | nfo":{"streamId" [LK-030A] > 3A 39 30 2C 22 66 69 6C 65 49 64 22 3A 31 2C 7D | :90,"fileId":1,} [LK-030A] > 2C 22 66 69 6C 65 42 6C 6F 63 6B 22 3A 7B 22 73 | ,"fileBlock":{"s [LK-030A] > 69 7A 65 22 3A 31 30 32 34 2C 22 6F 66 66 73 65 | ize":1024,"offse [LK-030A] > 74 22 3A 30 7D 7D 7D | t":0}}} - 物联网平台返回升级文件的日志：
[1635150287.455][LK-0309] pub: /sys/a18wP******/LightSwitch/thing/file/download_reply [LK-030A] < 00 73 7B 22 63 6F 64 65 22 3A 32 30 30 2C 22 64 | .s{"code":200,"d [LK-030A] < 61 74 61 22 3A 7B 22 66 69 6C 65 54 6F 6B 65 6E | ata":{"fileToken [LK-030A] < 22 3A 22 64 65 66 61 75 6C 74 22 2C 22 62 4F 66 | ":"default","bOf [LK-030A] < 66 73 65 74 22 3A 30 2C 22 66 69 6C 65 4C 65 6E | fset":0,"fileLen [LK-030A] < 67 74 68 22 3A 35 37 33 34 2C 22 62 53 69 7A 65 | gth":5734,"bSize [LK-030A] < 22 3A 31 30 32 34 7D 2C 22 69 64 22 3A 22 31 22 | ":1024},"id":"1" [LK-030A] < 2C 22 6D 65 73 73 61 67 65 22 3A 22 73 75 63 63 | ,"message":"succ [LK-030A] < 65 73 73 22 7D 50 4B 03 04 0A 00 00 00 00 00 47 | ess"}PK........G [LK-030A] < 84 7A 51 00 00 00 00 00 00 00 00 00 00 00 00 0C | .zQ............. [LK-030A] < 00 1C 00 61 69 6F 74 5F 63 5F 64 65 6D 6F 2F 55 | ...aiot_c_demo/U [LK-030A] < 54 09 00 03 85 68 BF 5F 86 68 BF 5F 75 78 0B 00 | T....h._.h._ux.. 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[LK-030A] < C6 F2 90 BB D4 F7 E9 5A 08 97 36 68 E2 E4 BC 4C | .......Z..6h...L [LK-030A] < 74 0B 95 68 61 8A CC 22 ED B2 58 2C 44 EE 81 44 | t..ha.."..X,D..D [LK-030A] < 25 05 E2 E0 52 86 20 52 55 84 11 2C 54 0E 2C 96 | %...R. RU..,T.,. [LK-030A] < 37 45 0A 33 35 79 56 | 7E.35yV [1635150287.455][LK-0000] header : {"code":200,"data":{"fileToken":"default","bOffset":0,"fileLength":5734,"bSize":1024},"id":"1","message":"success"}PK download 017% done, +1024 bytes - 升级文件下载完成的日志：
[1635150288.688][LK-0901] digest matched [1635150293.688][LK-0309] pub: /ota/device/progress/a18wP******/LightSwitch [LK-030A] > 7B 22 69 64 22 3A 37 2C 20 22 70 61 72 61 6D 73 | {"id":7, "params [LK-030A] > 22 3A 7B 22 73 74 65 70 22 3A 22 31 30 30 22 2C | ":{"step":"100", [LK-030A] > 22 64 65 73 63 22 3A 22 22 7D 7D | "desc":""}}
物联网平台日志
您可以在物联网平台控制台，查看例程运行后的日志信息。
OTA升级包情况：
在左侧导航栏，选择，在升级包列表查看升级包，了解升级情况。更多信息，请参见查看升级情况。在线状态：
在左侧导航栏，选择，找到设备，查看设备状态。设备状态显示为在线，则表示设备与物联网平台成功连接。
升级日志：
在左侧导航栏，选择，选择产品后，查看设备的上线、设备上报设备版本、物联网平台推送OTA升级包等日志。
后续步骤
运行日志中出现的错误信息，请参见aiot_mqtt_download_api.h中的状态码描述，根据提示解决问题。