问在Raspberry Pi上使用MQTT将传感器数据发布到Thingspeak时出错

EN

import time
import sys
from time import sleep
import paho.mqtt.publish as publish
import Adafruit_ADS1x15

#GPIO.setmode(GPIO.BOARD)

#Start of user config

channelID= "377509"
apiKey= "<APIKEY>"


#MQTT Connection Methods

useUnsecuredTCP= True

useUnsecuredWebsockets= False

useSSLWebsockets= False

mqttHost= "mqtt.thingspeak.com"

# You can use any Username.
mqttUsername = "SoilHumidityRpiDemo"

# Your MQTT API Key from Account > My Profile.
mqttAPIKey ="<APIKEY>"

if useUnsecuredWebsockets:
 tTransport= "websockets"
 tPort= 80

#Create topic string
topic= "channels/" + channelID + "/publish/" + apiKey


# Create an ADS1115 ADC (16-bit) instance.
adc = Adafruit_ADS1x15.ADS1115()

GAIN = 1

print('Reading ADS1x15 values, press Ctrl-C to quit...')

while True:
    m = adc.read_adc(0, gain=GAIN)
    print('Moisture Level:{0:>6}'.format(m))
    time.sleep(1)
    tPayload= "field1=%s" % m
    try:
      publish.single(topic, payload=tPayload, hostname=mqttHost, port=tPort, transport= tTransport,auth={'username':mqttUsername,'password':mqttAPIKey})
    except KeyboardInterrupt:
        break
    except:
        print ("There was an error publishing the data")