I am using the code for the micropython MQTT Publish example and receive the error noted above.(does connect to wifi and then the error occurs)
My other  BME280 library  programs otherwise work fine so my i2c connection is good.
So I tried  changing  # Read sensor data
temperature, humidity, pressure = get_sensor_readings()    to 
temperature,humidity,pressure =bme.get_sensor_readings()    at this point the error message changed to ‘bytes out of range” after connecting to wifi.
 
below is exact copy of the GitHub with i2c pins/channel changed.
from machine import Pin, I2Ca
from time import sleep
import network
from umqtt.simple import MQTTClient
import config
import BME280
# Constants for MQTT Topics
MQTT_TOPIC_TEMPERATURE = ‘pico/temperature’
MQTT_TOPIC_PRESSURE = ‘pico/pressure’
MQTT_TOPIC_HUMIDITY = ‘pico/humidity’
# MQTT Parameters
MQTT_SERVER = config.mqtt_server
MQTT_PORT = 0
MQTT_USER = config.mqtt_username
MQTT_PASSWORD = config.mqtt_password
MQTT_CLIENT_ID = b”raspberrypi_picow”
MQTT_KEEPALIVE = 7200
MQTT_SSL = True # set to False if using local Mosquitto MQTT broker
MQTT_SSL_PARAMS = {‘server_hostname’: MQTT_SERVER}
# Initialize I2C communication
i2c = I2C(id=1, scl=Pin(3), sda=Pin(2), freq=10000)
# Initialize BME280 sensor
bme = BME280.BME280(i2c=i2c, addr=0x76)
def get_sensor_readings():
temp = bme.temperature[:-1]
hum = bme.humidity[:-1]
pres = bme.pressure[:-3]
return temp, hum, pres
def initialize_wifi(ssid, password):
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
# Connect to the network
wlan.connect(ssid, password)
# Wait for Wi-Fi connection
connection_timeout = 10
while connection_timeout > 0:
if wlan.status() >= 3:
break
connection_timeout -= 1
print(‘Waiting for Wi-Fi connection…’)
sleep(1)
# Check if connection is successful
if wlan.status() != 3:
return False
else:
print(‘Connection successful!’)
network_info = wlan.ifconfig()
print(‘IP address:’, network_info[0])
return True
def connect_mqtt():
try:
client = MQTTClient(client_id=MQTT_CLIENT_ID,
server=MQTT_SERVER,
port=MQTT_PORT,
user=MQTT_USER,
password=MQTT_PASSWORD,
keepalive=MQTT_KEEPALIVE,
ssl=MQTT_SSL,
ssl_params=MQTT_SSL_PARAMS)
client.connect()
return client
except Exception as e:
print(‘Error connecting to MQTT:’, e)
raise # Re-raise the exception to see the full traceback
def publish_mqtt(topic, value):
client.publish(topic, value)
print(topic)
print(value)
print(“Publish Done”)
try:
if not initialize_wifi(config.wifi_ssid, config.wifi_password):
print(‘Error connecting to the network… exiting program’)
else:
# Connect to MQTT broker, start MQTT client
client = connect_mqtt()
while True:
# Read sensor data
temperature, humidity, pressure = get_sensor_readings()
# Publish as MQTT payload
publish_mqtt(MQTT_TOPIC_TEMPERATURE, str(temperature))
publish_mqtt(MQTT_TOPIC_PRESSURE, str(pressure))
publish_mqtt(MQTT_TOPIC_HUMIDITY, str(humidity))
# Delay 10 seconds
sleep(10)
except Exception as e:
print(‘Error:’, e)