我的物联网笔记1——Python+MQTT利用阿里云物联网平台实现图传

import paho.mqtt.client as mqtt
import ssl
import json
 
# 物联网平台连接参数，请根据实际情况填写
productKey = "您的productKey"
deviceName = "您的deviceName"
deviceSecret = "您的deviceSecret"
regionId = "cn-shanghai"  # 根据实际地域填写
 
# MQTT连接参数
broker = "iot.cn-shanghai.aliyuncs.com"  # 根据实际地域填写
port = 1883
topic_pub = "/sys/" + productKey + "/" + deviceName + "/thing/event/property/post"
topic_sub = "/sys/" + productKey + "/" + deviceName + "/thing/service/property/set"
 
# 设备上云并发送一条消息
def connect_mqtt():
    client_id = deviceName + "|securemode=3,signmethod=hmacsha1,timestamp=" + str(int(time.time()))
    client = mqtt.Client(client_id)
    client.username_pw_set(deviceName, sign(deviceName + "|" + productKey, deviceSecret))
    client.on_connect = on_connect
    client.on_message = on_message
    client.connect(broker, port, 60)
    client.subscribe(topic_sub)
    return client
 
# 签名生成函数
def sign(device_name, device_secret, parameters=None):
    # 此处省略签名计算代码
    pass
 
# 连接上云后的回调函数
def on_connect(client, userdata, flags, rc):
    if rc == 0:
        print("Connected to MQTT Broker!")
    else:
        print("Failed to connect, return code %d", rc)
 
# 接收服务器消息的回调函数
def on_message(client, userdata, message):
    print("Received message: ", str(message.payload.decode("utf-8")))
 
# 发送消息函数
def publish_message(client, topic, payload):
    client.publish(topic, payload)
 
# 发送图像数据到物联网平台
def send_image_data(client, image_path):
    with open(image_path, "rb") as file:
        image_data = file.read()
        payload = {"method": "thing.event.property.post", "id": str(uuid.uuid1()), "params": image_data, "version": "1.0"}
        client.publish(topic_pub, payload=json.dumps(payload), qos=1)
 
# 主函数
def main():
    client = connect_mqtt()
    client.loop_start()  # 开始循环以保持连接
    send_image_data(client, "path_to_your_image.jpg")  # 替换为你的图像路径
 
if __name__ == "__main__":
    main()

这个代码实例提供了连接到阿里云物联网平台的基本方法，并演示了如何发送一条包含图像数据的消息。注意，实际应用中需要提供正确的产品密钥、设备名称和设备密钥，并且需要将签名函数实现完整。此外，代码中的发送图像数据函数send_image_data需要替换为实际的图像路径。