[嵌入式]精简mqtt-client(python)

某次为了测试需要，用python写了个精简版mqtt-client。

这次测试的场景是mqtt-client连接broker，连接成功后批量订阅topics。

#-*- coding:utf-8 -*-
_author_ = 'cookie'
import paho.mqtt.client as mqtt #import the client1
import time

from paho.mqtt.client import MQTTv31,MQTTv311,MQTTv5

tempRC=-1
def on_connect(client, userdata, flags, rc):
    global tempRC
    print("rc of on_connect is ")
    print(rc)
    tempRC =int(rc)
    # client.loop_start()  # start the loop
    print("enter on_connect")
    print("begin to subscribe")
    time.sleep(0)
    subscribe_topic_array = [("VEHICLE_0*", 0), ("VEHICLE_1*", 0), ("VEHICLE_2*", 0)]
    rc_sub = client.subscribe(subscribe_topic_array)  # 订阅多个主题
    print("rc_sub is ",rc_sub)
    print("end to subscribe")
    client.loop_stop()  # stop the loop
    print("the Return Code value is : ")
    print(tempRC)

def on_subscribe(client,userdata,mid,granted_qos):
    print("enter onsubscribe")
    subscribe_topic_array = [("VEHICLE_0*", 2), ("VEHICLE_1*", 2), ("VEHICLE_2*", 2)]
    rc_sub = client.subscribe(subscribe_topic_array)  # 订阅多个主题
    print("rc_sub is ", rc_sub)
    print("end to subscribe")
    client.loop_stop()  # stop the loop

def on_message(client, userdata, message):
    print("message topic=", message.topic)
    print("message received ", message.payload)

broker_address = "192.168.0.1"
print("creating new instance")
print("connecting to broker ", broker_address)
client = mqtt.Client(client_id="client_id", protocol=MQTTv311, clean_session=True)
client.on_connect = on_subscribe
client.on_message = on_message
client.username_pw_set(username="name", password="abcdefg=")
client.max_inflight_messages_set(inflight=10)

try:
    print("begin to connect broker")
    rc = client.connect(broker_address, port=1883, keepalive=250)
    client.loop_start()
    print("rc of connect broker is ", rc)
    time.sleep(60)
except Exception as e:
    print(e.args)

测试日志打印如下

D:\Users\PycharmProjects\mqtt_test\venv\Scripts\python.exe D:/Users/PycharmProjects/mqtt_test/main.py
creating new instance
connecting to broker  192.168.0.1
begin to connect broker
rc of connect broker is  0
enter onsubscribe
rc_sub is  (0, 1)
end to subscribe

Process finished with exit code 0