jdz/GPS3.py

#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import serial
import time
import paho.mqtt.client as mqtt

ser = serial.Serial('/dev/ttyS0', 115200)
ser.flushInput()

# MQTT Configuration
MQTT_BROKER = "65.108.199.212"
MQTT_PORT = 1883
MQTT_TOPIC = "gps/coordinates"

# Create MQTT client
client = mqtt.Client()

def connect_mqtt():
    client.connect(MQTT_BROKER, MQTT_PORT)
    client.loop_start()

def send_at(command, back, timeout):
    rec_buff = ''
    ser.write((command+'\r\n').encode())
    time.sleep(timeout)
    if ser.inWaiting():
        time.sleep(0.01)
        rec_buff = ser.read(ser.inWaiting())
    if rec_buff != '':
        if back not in rec_buff.decode():
            print(command + ' ERROR')
            print(command + ' back:\t' + rec_buff.decode())
            return 0, rec_buff
        else:
            print(rec_buff.decode())
            return 1, rec_buff
    else:
        print('GPS no está listo')
        return 0, rec_buff

def get_gps_position():
    rec_null = True
    answer = 0
    print('Iniciando GPS')
    send_at('AT+CGPS=1,1','OK',1)
    time.sleep(2)
    while rec_null:
        answer, rec_buff = send_at('AT+CGPSINFO','+CGPSINFO: ',1)
        if answer == 1:
            if ',,,,,,' in rec_buff.decode():
                print('GPS no está listo')
            else:
                # Parse GPS data
                gps_data = rec_buff.decode().split('+CGPSINFO: ')[1].strip()
                lat, lon = parse_gps_data(gps_data)
                if lat and lon:
                    # Send GPS coordinates to MQTT broker
                    mqtt_payload = f"{lat},{lon}"
                    client.publish(MQTT_TOPIC, mqtt_payload)
                    print(f"Sent to MQTT: {mqtt_payload}")
                rec_null = False
        else:
            print('error %d'%answer)
            send_at('AT+CGPS=0','OK',1)
            return False
        time.sleep(1.5)

def parse_gps_data(gps_data):
    parts = gps_data.split(',')
    if len(parts) >= 4:
        lat = convert_to_degrees(parts[0])
        lon = convert_to_degrees(parts[2])
        return lat, lon
    return None, None

def convert_to_degrees(raw_value):
    if raw_value:
        degree = float(raw_value[:2])
        minute = float(raw_value[2:])
        return degree + (minute / 60.0)
    return None

def power_on(power_key):
    print('SIM7600X is starting:')
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)
    GPIO.setup(power_key,GPIO.OUT)
    time.sleep(0.1)
    GPIO.output(power_key,GPIO.HIGH)
    time.sleep(2)
    GPIO.output(power_key,GPIO.LOW)
    time.sleep(20)
    ser.flushInput()
    print('SIM7600X is ready')

def power_down(power_key):
    print('SIM7600X is loging off:')
    GPIO.output(power_key,GPIO.HIGH)
    time.sleep(3)
    GPIO.output(power_key,GPIO.LOW)
    time.sleep(18)
    print('Good bye')

try:
    power_key = 6  # Assuming power key is connected to GPIO 6
    connect_mqtt()
    power_on(power_key)
    get_gps_position()
    power_down(power_key)
except Exception as e:
    print(f"An error occurred: {e}")
finally:
    if ser is not None:
        ser.close()
    client.loop_stop()
    client.disconnect()
    GPIO.cleanup()