使用Python Paho MQTT客户端的最可靠方法是什么?我希望能够处理由于WiFi丢失引起的连接中断,并继续尝试重新连接,直到它成功。
我所拥有的是以下内容,但有没有我不遵守的最佳做法?
import argparse
from time import sleep
import paho.mqtt.client as mqtt
SUB_TOPICS = ("topic/something", "topic/something_else")
RECONNECT_DELAY_SECS = 2
def on_connect(client, userdata, flags, rc):
print "Connected with result code %s" % rc
for topic in SUB_TOPICS:
client.subscribe(topic)
# EDIT: I've removed this function because the library handles
# reconnection on its own anyway.
# def on_disconnect(client, userdata, rc):
# print "Disconnected from MQTT server with code: %s" % rc
# while rc != 0:
# sleep(RECONNECT_DELAY_SECS)
# print "Reconnecting..."
# rc = client.reconnect()
def on_msg(client, userdata, msg):
print "%s %s" % (msg.topic, msg.payload)
if __name__ == "__main__":
p = argparse.ArgumentParser()
p.add_argument("user")
p.add_argument("password")
p.add_argument("host")
p.add_argument("--port", type=int, default=1883)
args = p.parse_args()
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_msg
client.username_pw_set(args.user, args.password)
client.connect(args.host, args.port, 60)
client.loop_start()
try:
while True:
sleep(1)
except KeyboardInterrupt:
pass
finally:
client.loop_stop()
答案 0 :(得分:6)
这些选项有助于确保在连接恢复后,将在断开连接时发布任何消息。
您可以在构造函数
中设置client_id和clean_session标志client = mqtt.Client(client_id="foo123", clean_session=False)
在主题
之后设置订阅的QOSclient.subscribe(topic, qos=1)