esp32+4G+MQTT如何使用MicroPython设置订阅温度传感器的主题·
时间: 2023-05-21 18:02:03 浏览: 71
您可以使用以下代码来设置订阅温度传感器的主题:
```python
import machine
import ubinascii
import ujson
from umqtt.robust import MQTTClient
# Replace with your own values
WIFI_SSID = "your_wifi_ssid"
WIFI_PASSWORD = "your_wifi_password"
MQTT_BROKER = "your_mqtt_broker"
MQTT_PORT = 1883
MQTT_USER = "your_mqtt_user"
MQTT_PASSWORD = "your_mqtt_password"
TOPIC = "your_topic"
# Connect to WiFi
station = machine.RTC().memory()
if not station.get('ssid'):
station.set('ssid', WIFI_SSID)
station.set('wifi_pw', WIFI_PASSWORD)
machine.reset()
else:
import network
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(station.get('ssid'), station.get('wifi_pw'))
while not wlan.isconnected():
pass
# Connect to MQTT broker
client_id = ubinascii.hexlify(machine.unique_id()).decode()
client = MQTTClient(client_id, MQTT_BROKER, MQTT_PORT, MQTT_USER, MQTT_PASSWORD)
client.connect()
# Subscribe to topic
client.subscribe(TOPIC)
# Define callback function
def sub_cb(topic, msg):
print((topic, msg))
# Wait for messages
client.set_callback(sub_cb)
while True:
client.wait_msg()
```
请注意,您需要安装 umqtt.robust 库来使用此代码。您可以使用以下命令在 MicroPython 中安装该库:
```python
import upip
upip.install('micropython-umqtt.robust')
```