♦Traceback (most recent call last):
File "<stdin>", line 14, in <module>
File "/flash/lib/mqtt.py", line 140, in subscribe
TypeError: function missing 1 required positional arguments

    struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
    #print(hex(len(pkt)), hexlify(pkt, ":"))
    self.sock.write(pkt)
    self._send_str(topic)
    self.sock.write(qos.to_bytes(1))  # LINE 140
    while 1:
        op = self.wait_msg()
        if op == 0x90:
            resp = self.sock.read(4)

from network import WLAN
from mqtt import MQTTClient
import machine
import time

print("Setup::event")
def sub_cb(topic, msg):
print("mqtt::",topic,"msg[",msg,"]")

print("Connected to Wifi\n")
client = MQTTClient("demo", "test.smallbiz.com.au", port=1883)
client.settimeout = 10000
client.set_callback(sub_cb)
client.connect()
client.subscribe(topic="lopy01/inbox")

while True:
print("Sending ON")
client.publish("lopy01/outbox/", "ON")
time.sleep(1)
print("Sending OFF")
client.publish("lopy01/outbox/", "OFF")
time.sleep(1)