'Client' object has no attribute '_on_pre_connect'

[Juma]

Hi

I need help finding what the issue could be with my MQTT publish.single function below;

import serial
import csv
import time
import json
import paho.mqtt.publish as publish

ser = serial.Serial('/dev/serial0', 9600, timeout=1)

def read_data():
    data_in = ser.readline()
    data = list(data_in)
    distance = (570-(data[1]*256 + data[2]))/10
    volume = round(28 * distance,0)
    read_data.reading = {'volume':volume}

def mqttpublish(hostname,topic,payload,qos=0):
    try:
        publish.single("water/tank", payload=json.dumps(read_data.reading), qos=qos, hostname="10.0.0.3", auth={'username':"utility", 'password':"pass"})
    except Exception as e:
        print("Publish Failed because: %s"%e)

read_data()
mqttpublish()

It throws the error: 'Client' object has no attribute '_on_pre_connect'

[Matt Lloyd]

Quick guess you have sed master from https://github.com/eclipse/paho.mqtt.python not the latest tag 1.6.1 which does not have that new code

https://github.com/eclipse/paho.mqtt.python/commit/a4cb435ca2864d073ea3e0e18b0407e4bbe85b16

https://github.com/eclipse/paho.mqtt.python/issues/658#issuecomment-1399093109

https://github.com/eclipse/paho.mqtt.python/issues/703

Matt

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[Juma]

Thanks,
Am a bit new to scripting, how do I use this?