8.875 C on ip No  190  17:59:42
9.0 C on ip No  190  18:00:44
9.0 C on ip No  190  18:01:46
9.0 C on ip No  190  18:02:48
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.7/dist-packages/paho/mqtt/client.py", line 3452,                                   in _thread_main
    self.loop_forever(retry_first_connection=True)
  File "/usr/local/lib/python3.7/dist-packages/paho/mqtt/client.py", line 1779,                                   in loop_forever
    rc = self.loop(timeout, max_packets)
  File "/usr/local/lib/python3.7/dist-packages/paho/mqtt/client.py", line 1201,                                   in loop
    return self.loop_misc()
  File "/usr/local/lib/python3.7/dist-packages/paho/mqtt/client.py", line 1628,                                   in loop_misc
    self._check_keepalive()
  File "/usr/local/lib/python3.7/dist-packages/paho/mqtt/client.py", line 2430,                                   in _check_keepalive
    self._do_on_disconnect(rc)
  File "/usr/local/lib/python3.7/dist-packages/paho/mqtt/client.py", line 3360,                                   in _do_on_disconnect
    self.on_disconnect(self, self._userdata, rc)
TypeError: on_disconnect() missing 1 required positional argument: 'rc'

8.937 C on ip No  190  18:03:50
8.937 C on ip No  190  18:04:51
9.0 C on ip No  190  18:05:53

# -- Setup -------------------------------------------------------------
import datetime, time, glob, os, subprocess
import paho.mqtt.client as mqtt
 
filename = " 18b20-testnolibmq2X.py"
print (filename + "   restarted  at  " + time.strftime("%H:%M:%S"))
 
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

ip = subprocess.getoutput("hostname -I")     # get the ip address
print("ip is "+ip)
ipl3 = ip[10:13]
queue = ("highmount/temp/"+ipl3)             # use ip as queue name

# Functions ------------------------------------------------------------ 
def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines
# ---------------------------------------------------------------------- 
def read_temp():
    try:                                        # trap errors if it doesn't read
        lines = read_temp_raw()
        while lines[0].strip()[-3:] != 'YES':   # error check
            time.sleep(2)                       # if error wait for N sec
            print ("Pause to re-read")
            writetolog(" re-read ")
            lines = read_temp_raw()             # try again - re-read temp
        equals_pos = lines[1].find('t=')
        if equals_pos != -1:
            temp_string = lines[1][equals_pos+2:]
            temp_c = float(temp_string) / 1000.0
            return temp_c
    except:
        print("Oops - error!")
        writetolog( "  Error  ")
# ----------------------------------------------------------------------
def writetolog(logmessage):                      # Write log messages to log file - called by each sensor check
    fo = open("/home/pi/test/18b20/logfile.txt", "r+")          # open the file smlog.txt or /var/www/html/sysmanlog.txt, r+ is read and write
    existing=fo.read()                           # import existing content
    fo.seek(0,0)                                 # move pointer to start of file
    fo.write(time.strftime("%A: %d  %H:%M:%S   ")+logmessage+"\n"+ existing)   # append new text
    fo.close()                                   # close the file 
# ----------------------------------------------------------------------
def on_connect(mqttc, userdata, flags, rc):
    mqttc.subscribe(queue, 0)                # Connect queue 
    writetolog ("Connected with result code  " +str(rc)+"   "+ time.strftime("%A %d  %H:%M:%S   "))
    mqttc.publish("highmount/status", payload=filename+" Online",qos=1, retain=True) 
#-----------------------------------------------------------------------
def on_disconnect(mqttc, userdata, flags, rc):
    writetolog ("HELP DISConnected with result code  " +str(rc)+"   "+ time.strftime("%A %d  %H:%M:%S   ")) 
#-----------------------------------------------------------------------    
    
#---- Main programme ---------------------------------------------------
mqttc = mqtt.Client()                          # Alias for MQTT Client
mqttc.on_connect = on_connect
mqttc.on_disconnect = on_disconnect
mqttc.will_set("highmount/status", payload=filename+"     Offline", qos=1, retain=True)
mqttc.connect("broker.hivemq.com", port=1883, keepalive=10)       # Connect to server - this calls on_connect
        
# --- Start of loop  ---------------------------------------------------
try:
    while True:
        print(str(read_temp())+" C on ip No  "+ipl3+"  "+ time.strftime("%H:%M:%S"))
        mqttc.publish(queue, read_temp(),1)
        mqttc.loop_start() 
        time.sleep(60)

except KeyboardInterrupt:                      # ...  and to clean exit
    print(" Control C breakout ...")