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aws-iot-devices-sdk 是亚马逊针对物联网推出的一套解决方案，这里主要记录如何初步跑起来。
官方文档写的已经足够详细了，一定要看官网最新的英文版，看文档过程中，发现中文版已经落后很久了。
可以对比下AWS IoT SDK Tutorials，英文和中文描述就相差很大。 这里以英文版为主。
添加设备
这里主要登录AWS IoT添加一个设备，官方英文文档中的Connecting Your Raspberry Pi to AWS IoT写的已经很详细了，这里就不再复述，注册完成之后的界面:
注册过程中需要下载公钥和密钥
rootCA需要单独复制出来保存为rootCA.crt，选择图中高亮的CA即可
示例编译运行
下载源代码
git clone https://github.com/aws/aws-iot-device-sdk-embedded-C.git -b release
编译源代码之前，需要安装CppUTest和Mbedtls第三方库,只需要把官方的源码复制到aws-iot-device-sdk-embedded-C/external_libs/ 对应的额目录即可
mbedtls 解压源码复制到aws-iot-device-sdk-embedded-C/external_libs/mbedTLS
https://tls.mbed.org/download/start/mbedtls-2.11.0-apache.tgz
cpputest 解压源码复制到aws-iot-device-sdk-embedded-C/external_libs/CppUTest
https://github.com/cpputest/cpputest/releases/tag/v3.6
拷贝aws iot 后台创建设备时生成的证书到 aws-iot-device-sdk-embedded-C/certs
//证书如下
certs git:(release) ✗ >ls
47e9f5f0d6-certificate.pem.crt 47e9f5f0d6-private.pem.key 47e9f5f0d6-public.pem.key README.txt rootCA.crt
这里以samples/linux/subscribe_publish_sample为例，编译之前，需要修aws_iot_config.h的配置，主要修改如下字段
// =================================================
#define AWS_IOT_MQTT_HOST "a317ak53zstmeq-ats.iot.us-east-1.amazonaws.com" ///< Customer specific MQTT HOST. The same will be used for Thing Shadow
#define AWS_IOT_MQTT_PORT 443 ///< default port for MQTT/S
#define AWS_IOT_MQTT_CLIENT_ID "c-sdk-client-id" ///< MQTT client ID should be unique for every device
#define AWS_IOT_MY_THING_NAME "MyRaspberryPI" ///< Thing Name of the Shadow this device is associated with
#define AWS_IOT_ROOT_CA_FILENAME "rootCA.crt" ///< Root CA file name
#define AWS_IOT_CERTIFICATE_FILENAME "47e9f5f0d6-certificate.pem.crt" ///< device signed certificate file name
#define AWS_IOT_PRIVATE_KEY_FILENAME "47e9f5f0d6-private.pem.key" ///< Device private key filename
完成之后，编译成功运行如下:
➜ subscribe_publish_sample git:(release) ✗ >./subscribe_publish_sample
AWS IoT SDK Version 3.0.1-
DEBUG: main L#159 rootCA /home/zhaomm/Code/code/aws-iot-device-sdk-embedded-C/samples/linux/subscribe_publish_sample/../../../certs/rootCA.crt
DEBUG: main L#160 clientCRT /home/zhaomm/Code/code/aws-iot-device-sdk-embedded-C/samples/linux/subscribe_publish_sample/../../../certs/47e9f5f0d6-certificate.pem.crt
DEBUG: main L#161 clientKey /home/zhaomm/Code/code/aws-iot-device-sdk-embedded-C/samples/linux/subscribe_publish_sample/../../../certs/47e9f5f0d6-private.pem.key
Connecting...
DEBUG: iot_tls_connect L#130
. Seeding the random number generator...
DEBUG: iot_tls_connect L#138 . Loading the CA root certificate ...
DEBUG: iot_tls_connect L#144 ok (0 skipped)
DEBUG: iot_tls_connect L#146 . Loading the client cert. and key...
DEBUG: iot_tls_connect L#159 ok
DEBUG: iot_tls_connect L#161 . Connecting to a317ak53zstmeq-ats.iot.us-east-1.amazonaws.com/8883...
DEBUG: iot_tls_connect L#180 ok
DEBUG: iot_tls_connect L#182 . Setting up the SSL/TLS structure...
DEBUG: iot_tls_connect L#223
SSL state connect : 0
DEBUG: iot_tls_connect L#226 ok
DEBUG: iot_tls_connect L#228
SSL state connect : 0
DEBUG: iot_tls_connect L#229 . Performing the SSL/TLS handshake...
DEBUG: _iot_tls_verify_cert L#49
Verify requested for (Depth 2):
DEBUG: _iot_tls_verify_cert L#51 cert. version : 3
serial number : 06:6C:9F:CF:99:BF:8C:0A:39:E2:F0:78:8A:43:E6:96:36:5B:CA
issuer name : C=US, O=Amazon, CN=Amazon Root CA 1
subject name : C=US, O=Amazon, CN=Amazon Root CA 1
issued on : 2015-05-26 00:00:00
expires on : 2038-01-17 00:00:00
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=true
key usage : Digital Signature, Key Cert Sign, CRL Sign
DEBUG: _iot_tls_verify_cert L#54 This certificate has no flags
DEBUG: _iot_tls_verify_cert L#49
Verify requested for (Depth 1):
DEBUG: _iot_tls_verify_cert L#51 cert. version : 3
serial number : 06:7F:94:57:85:87:E8:AC:77:DE:B2:53:32:5B:BC:99:8B:56:0D
issuer name : C=US, O=Amazon, CN=Amazon Root CA 1
subject name : C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
issued on : 2015-10-22 00:00:00
expires on : 2025-10-19 00:00:00
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=true, max_pathlen=0
key usage : Digital Signature, Key Cert Sign, CRL Sign
DEBUG: _iot_tls_verify_cert L#54 This certificate has no flags
DEBUG: _iot_tls_verify_cert L#49
Verify requested for (Depth 0):
DEBUG: _iot_tls_verify_cert L#51 cert. version : 3
serial number : 06:66:B4:8C:67:DF:2F:E7:A9:A2:26:55:3E:71:EE:24
issuer name : C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
subject name : CN=*.iot.us-east-1.amazonaws.com
issued on : 2018-08-02 00:00:00
expires on : 2019-08-02 12:00:00
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=false
subject alt name : iot.us-east-1.amazonaws.com, *.iot.us-east-1.amazonaws.com
key usage : Digital Signature, Key Encipherment
ext key usage : TLS Web Server Authentication, TLS Web Client Authentication
DEBUG: _iot_tls_verify_cert L#54 This certificate has no flags
DEBUG: iot_tls_connect L#246 ok
[ Protocol is TLSv1.2 ]
[ Ciphersuite is TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384 ]
DEBUG: iot_tls_connect L#248 [ Record expansion is 29 ]
DEBUG: iot_tls_connect L#253 . Verifying peer X.509 certificate...
DEBUG: iot_tls_connect L#262 ok
DEBUG: iot_tls_connect L#272 . Peer certificate information ...
DEBUG: iot_tls_connect L#274 cert. version : 3
serial number : 06:66:B4:8C:67:DF:2F:E7:A9:A2:26:55:3E:71:EE:24
issuer name : C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
subject name : CN=*.iot.us-east-1.amazonaws.com
issued on : 2018-08-02 00:00:00
expires on : 2019-08-02 12:00:00
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=false
subject alt name : iot.us-east-1.amazonaws.com, *.iot.us-east-1.amazonaws.com
key usage : Digital Signature, Key Encipherment
ext key usage : TLS Web Server Authentication, TLS Web Client Authentication
Subscribing...
-->sleep
Subscribe callback
sdkTest/sub hello from SDK QOS0 : 0
Subscribe callback
sdkTest/sub hello from SDK QOS1 : 1
-->sleep