AWS IOT服务默认只支持连接一个设备。如果要在同一时间内连接多个设备,需要进行以下步骤:
例如,假设有两个设备:Device1和Device2。则需要创建两个AWS IOT客户端。示例代码如下:
import boto3 import json from AWSIoTPythonSDK.MQTTLib import AWSIoTMQTTClient
host = "xxx.iot.us-west-2.amazonaws.com" certPath = "/path/to/cert/" clientId = "Device1"
myAWSIoTMQTTClient = AWSIoTMQTTClient(clientId) myAWSIoTMQTTClient.configureEndpoint(host, 8883) myAWSIoTMQTTClient.configureCredentials(certPath + "root-CA.crt", certPath + "Device1.private.key", certPath + "Device1.cert.pem")
host = "xxx.iot.us-west-2.amazonaws.com" certPath = "/path/to/cert/" clientId = "Device2"
myAWSIoTMQTTClient = AWSIoTMQTTClient(clientId) myAWSIoTMQTTClient.configureEndpoint(host, 8883) myAWSIoTMQTTClient.configureCredentials(certPath + "root-CA.crt", certPath + "Device2.private.key", certPath + "Device2.cert.pem")
在AWS IOT服务中为每个设备设置单独的证书和密钥,并将它们与相应的AWS IOT客户端关联。这些证书和密钥将用于AWS IOT服务和设备之间的安全通信。
在AWS IOT服务中为每个设备创建单独的主题,并将其与相应的AWS IOT客户端关联。这将确保不同设备之间的消息不会互相干扰。
根据需要设置AWS IOT服务的规则以处理不同设备的消息。
在设备端,使用AWS IOT客户端连接到AWS IOT服务并发布/订阅与其关联的主题。示例代码如下:
myAWSIoTMQTTClient.connect()
myAWSIoTMQTTClient.publish("Device1/topic", "Hello from Device1", 0)
def customCallback(client, userdata, message): print("Received a new message: ") print(message.payload.decode("utf-8"))
myAWSIoTMQTTClient.subscribe("Device1/topic", 1, customCallback)