MQTT - Is there a way to check if the client is still connected

user_4845068 0
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Is there a way to check if the client is still connected to the MQTT broker?

Something like 

if client.isConnected(): # for example
    # if True then do stuff

Edit: There was instance where my Raspberry Pi stopped receiving from the client although it was still (from the look of it, the code was still showing updated results) running.

Here is the code since I may be doing something wrong:

client = mqtt.Client()
client.connect(address, 1883, 60)

while True:
    data = getdata()
    client.publish("$ahmed/",data,0)
    time.sleep(0.2)

The thing is that I was away, so I am not even sure why it stopped! Only if I restart my broker then it will start receiving again.

mqtt python
4 Answers

You can use will message to do this.

client=mqtt.Client()
client.will_set('will_message_topic',payload=time.time(),qos=2,retain=True)
client.connect(address,1883,60)
client.publish('will_message_topic',payload='I am alive',qos=2,retain=True)
client.loop_start()#this line is important
while 1:#faster than while True
    you loop

By leaving a will message, you can use another client to make sure if the client is online or not.

user_142387890

Here is the API available. You just use client.is_connected() returns True or False.

user_195246150
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