jdz/gps_nx.py

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Python
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2024-07-25 01:10:28 +00:00
import serial
import pynmea2
import paho.mqtt.client as mqtt
# Configuration
GPS_PORT = '/dev/ttyS0' # change this if your GPS device is on a different port
MQTT_BROKER = '65.108.199.212'
MQTT_PORT = 1883
TOPIC = 'iiot/coordinates'
def on_connect(client, userdata, flags, rc):
"""Callback for when the client connects to the broker."""
print(f"Connected with result code {rc}")
client.subscribe(TOPIC)
def on_message(client, userdata, msg):
"""Callback for when a message is received from the broker."""
print(f"Received message: {msg.payload.decode('utf-8')}")
# Create MQTT client
client = mqtt.Client()
# Connect to MQTT broker
client.on_connect = on_connect
client.on_message = on_message
try:
client.connect(MQTT_BROKER, MQTT_PORT)
except Exception as e:
print(f"Error connecting to MQTT broker: {e}")
exit()
# Open GPS device serial port
try:
gps_dev = serial.Serial(GPS_PORT, 9600, timeout=1) # change baudrate and timeout if needed
except serial.SerialException as e:
print(f"Error opening GPS device serial port: {e}")
exit()
while True:
try:
line = gps_dev.readline().decode('utf-8')
if line.startswith('$GPGGA'):
msg = pynmea2.parse(line)
latitude = msg.latitude
longitude = msg.longitude
print(f"Latitude: {latitude}, Longitude: {longitude}")
client.publish(TOPIC, f"{latitude},{longitude}")
except Exception as e:
print(f"Error parsing GPS data or publishing to MQTT broker: {e}")