MicroPython - ESP32 WiFi MQTT 통신 : subscribe

main.py

from network import WLAN, STA_IF
from time import time, sleep
from usocket import socket
from mqttclient import MQTTClient

SERVER = 'broker.mqttdashboard.com'
PORT = 1883
CLIENT_ID = 'esp32'
TOPIC = 'devicemart'

wlan = WLAN(STA_IF)
wlan.active(True)
start_time = time()

if not wlan.isconnected():
    print('Connecting to network...')
    wlan.connect('devicemart', 'devicemart1')
    
    while not wlan.isconnected():
        if time() - start_time > 15:
            print('Connecting WiFi Timeout!')
            quit()
        
config = wlan.ifconfig()
print(config)

print('IP : ' + config[0])
print('SUBNET : ' + config[1])
print('GATEWAY : ' + config[2])
print('DNS : ' + config[3])

def on_subscribe(topic, msg):
    print('topic: {}'.format(topic))
    print('msg: {}'.format(msg)) 

client = MQTTClient(CLIENT_ID, SERVER, PORT)
client.set_callback(on_subscribe)
client.connect()
client.subscribe(TOPIC)

while True:
    client.check_msg()
    sleep(0.3)