HTTPS协议下载单个文件升级包的OTA升级功能例程运行后，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/fota_posix_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。[1579511737.377][LK-0313] MQTT user calls aiot_mqtt_connect api, connect [1579511737.377][LK-0317] LightSwitch&a18wP****** [1579511737.377][LK-0318] 779ACA0181ED1C0BD4B1BA7A347C9B172E27EAAB4AA18FC1F9FAD4CED1******* [1579511737.377][LK-0319] a18wP******.LightSwitch|timestamp=2524608000000,_ss=1,_v=sdk-c-4.0.0,securemode=2,signmethod=hmacsha256,ext=1,| establish mbedtls connection with server(host='a18wP******.iot-as-mqtt.cn-shanghai.aliyuncs.com', port=[443]) success to establish mbedtls connection, fd = 3(cost 44763 bytes in total, max used 47675 bytes) [1579511737.522][LK-0313] MQTT connect success in 152 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。[1579511826.577][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 31 32 | data":{"size":12 [LK-030A] < 34 38 33 30 36 2C 22 73 69 67 6E 22 3A 22 34 62 | 48306,"sign":"4b [LK-030A] < 66 61 63 65 66 35 63 62 61 30 61 35 36 64 63 32 | facef5cba0a56dc2 [LK-030A] < 62 65 62 38 65 65 30 33 65 32 62 65 30 61 37 61 | beb8ee03e2be0a7a [LK-030A] < 65 64 65 65 65 31 38 38 35 61 63 65 30 66 62 35 | edeee1885ace0fb5 [LK-030A] < 35 65 61 38 62 62 66 64 39 38 64 61 64 63 22 2C | 5ea8bbfd******", [LK-030A] < 22 76 65 72 73 69 6F 6E 22 3A 22 31 2E 31 2E 30 | "version":"1.1.0 [LK-030A] < 22 2C 22 75 72 6C 22 3A 22 68 74 74 70 73 3A 2F | ","url":"https:/ [LK-030A] < 2F 6F 74 61 2E 69 6F 74 2D 74 68 69 6E 67 2E 63 | /ota.iot-thing.c [LK-030A] < 6E 2D 73 68 61 6E 67 68 61 69 2E 61 6C 69 79 75 | n-shanghai.aliyu [LK-030A] < 6E 63 73 2E 63 6F 6D 2F 6F 74 61 2F 36 35 64 66 | ncs.com/ota/65df [LK-030A] < 63 64 61 30 34 37 33 62 65 32 39 38 33 36 64 66 | cda0473be29836df [LK-030A] < 64 65 35 38 35 34 37 32 37 65 31 32 2F 63 6B 35 | de5854******/ck5 [LK-030A] < 32 6E 79 6F 31 7A 30 30 30 30 33 39 37 69 69 79 | 2nyo1z0000397iiy [LK-030A] < 76 68 6E 72 32 69 2E 62 69 6E 3F 45 78 70 69 72 | ******.bin?Expir [LK-030A] < 65 73 3D 31 35 37 39 35 39 38 32 32 36 26 4F 53 | es=1579598226&OS [LK-030A] < 53 41 63 63 65 73 73 4B 65 79 49 64 3D 63 53 38 | SAccessKeyId=cS8 [LK-030A] < 75 52 52 79 35 34 52 73 7A 59 57 6E 61 26 53 69 | uRRy54R******&Si [LK-030A] < 67 6E 61 74 75 72 65 3D 42 4F 55 46 51 65 34 68 | gnature=BOUFQe4h [LK-030A] < 39 6E 36 41 64 5A 57 46 42 45 49 7A 33 5A 6A 70 | 9n6AdZWFBEIz3Zjp [LK-030A] < 42 70 59 25 33 44 22 2C 22 73 69 67 6E 4D 65 74 | ******","signMet [LK-030A] < 68 6F 64 22 3A 22 53 48 41 32 35 36 22 7D 2C 22 | hod":"SHA256"}," [LK-030A] < 69 64 22 3A 31 35 37 39 35 31 31 38 32 36 35 32 | id":157951182652 [LK-030A] < 30 2C 22 6D 65 73 73 61 67 65 22 3A 22 73 75 63 | 0,"message":"suc [LK-030A] < 63 65 73 73 22 7D | cess"}升级包下载过程日志：
以下日志显示设备开始下载升级包，并获取下载进度，直至下载完成。
OTA target firmware version: 1.1.0, size: 1248306 Bytes starting download thread in 2 seconds ...... establish mbedtls connection with server(host='ota.iot-thing.cn-shanghai.aliyuncs.com', port=[443]) success to establish mbedtls connection, fd = 4(cost 44868 bytes in total, max used 47604 bytes) [1579511828.699][LK-040B] > GET /ota/65dfcda0473be29836dfde5854******/ck52nyo1z0000397iiy******.bin?Expires=1579598226&OSSAccessKeyId=cS8uRRy54R******&Signature [1579511828.699][LK-040B] > Host: ota.iot-thing.cn-shanghai.aliyuncs.com [1579511828.699][LK-040B] > Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 [1579511828.699][LK-040B] > Range: bytes=0- [1579511828.699][LK-040B] > Content-Length: 0 [1579511828.699][LK-040B] > [1579511828.699][LK-0309] pub: /ota/device/progress/a18wP******/LightSwitch [LK-030A] > 7B 22 69 64 22 3A 31 2C 20 22 70 61 72 61 6D 73 | {"id":1, "params [LK-030A] > 22 3A 7B 22 73 74 65 70 22 3A 22 30 22 2C 22 64 | ":{"step":"0","d [LK-030A] > 65 73 63 22 3A 22 22 7D 7D | esc":""}} [1579511828.755][LK-040D] < HTTP/1.1 206 Partial Content [1579511828.755][LK-040D] < Date: Mon, 20 Jan 2020 09:17:08 GMT [1579511828.755][LK-040D] < Content-Type: application/octet-stream [1579511828.755][LK-040D] < Content-Length: 1248306 [1579511828.755][LK-040D] < Connection: keep-alive [1579511828.755][LK-040D] < x-oss-request-id: 5E2570140838A33233****** [1579511828.755][LK-040D] < Content-Range: bytes 0-1248305/1248306 [1579511828.755][LK-040D] < Accept-Ranges: bytes [1579511828.755][LK-040D] < ETag: "4818CE191A4E2A93EE2DF17938******" [1579511828.755][LK-040D] < Last-Modified: Mon, 06 Jan 2020 16:32:55 GMT [1579511828.755][LK-040D] < x-oss-object-type: Normal [1579511828.755][LK-040D] < x-oss-hash-crc64ecma: 14290028752135****** [1579511828.755][LK-040D] < x-oss-storage-class: Standard [1579511828.755][LK-040D] < Content-MD5: SBjOGRpOKpPuLfF5OC****** [1579511828.755][LK-040D] < x-oss-server-time: 47 [1579511828.755][LK-040D] < download 005% done, +8192 bytes [1579511828.777][LK-0309] pub: /ota/device/progress/a18wP******/LightSwitch [LK-030A] > 7B 22 69 64 22 3A 32 2C 20 22 70 61 72 61 6D 73 | {"id":2, "params [LK-030A] > 22 3A 7B 22 73 74 65 70 22 3A 22 35 22 2C 22 64 | ":{"step":"5","d [LK-030A] > 65 73 63 22 3A 22 22 7D 7D | esc":""}} download 010% done, +8192 bytes [1579511828.788][LK-0309] pub: /ota/device/progress/a18wP******/LightSwitch [LK-030A] > 7B 22 69 64 22 3A 33 2C 20 22 70 61 72 61 6D 73 | {"id":3, "params [LK-030A] > 22 3A 7B 22 73 74 65 70 22 3A 22 31 30 22 2C 22 | ":{"step":"10"," [LK-030A] > 64 65 73 63 22 3A 22 22 7D 7D | desc":""}} …… …… [LK-030A] > 7B 22 69 64 22 3A 32 30 2C 20 22 70 61 72 61 6D | {"id":20, "param [LK-030A] > 73 22 3A 7B 22 73 74 65 70 22 3A 22 39 35 22 2C | s":{"step":"95", [LK-030A] > 22 64 65 73 63 22 3A 22 22 7D 7D | "desc":""}} [1579511828.833][LK-0901] digest matched download 100% done, +3122 bytes [1579511828.833][LK-0309] pub: /ota/device/progress/a18wP******/LightSwitch [LK-030A] > 7B 22 69 64 22 3A 32 31 2C 20 22 70 61 72 61 6D | {"id":21, "param [LK-030A] > 73 22 3A 7B 22 73 74 65 70 22 3A 22 31 30 30 22 | s":{"step":"100" [LK-030A] > 2C 22 64 65 73 63 22 3A 22 22 7D 7D | ,"desc":""}} download completed download thread exit
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_ota_api.h中的状态码描述，根据提示解决问题。