jdz/gps00.py

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

# MQTT Broker settings

mqttBroker ="65.108.199.212"
myhost = os.uname()[1]
client = mqtt.Client(myhost)
# client.connect(mqttBroker, 1883)

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

rec_buff = ''
time_count = 0

def convert_to_decimal(coord_str):
    # Split the coordinate into degrees, minutes, and direction
    coord = coord_str[:-2]
    direction = coord_str[-1]
    
    degrees = float(coord[:2] if direction in ['N', 'S'] else coord[:3])
    minutes = float(coord[2:] if direction in ['N', 'S'] else coord[3:])
    
    # Convert to decimal degrees
    decimal = degrees + (minutes / 60)
    
    # Make negative if South or West
    if direction in ['S', 'W']:
        decimal = -decimal
    
    return decimal

def parse_gps_data(gps_string):
    parts = gps_string.split(',')
    if len(parts) != 4:
        return "Invalid GPS data"
    
    lat = convert_to_decimal(parts[0] + ',' + parts[1])
    lon = convert_to_decimal(parts[2] + ',' + parts[3])
    
    return f"{lat:.6f}, {lon:.6f}"

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
        else:
            gps_data = rec_buff.decode()[13:-36]
            print("Raw GPS data:", gps_data)
            converted_gps = parse_gps_data(gps_data)
            print("Converted GPS data for Google Maps:", converted_gps)
            client.publish("iiot/"+ myhost +"/gps", converted_gps)
            return 1
    else:
        print('GPS no está listo')
        return 0

def get_gps_position():
	rec_null = True
	answer = 0
	print('Iniciando GPS')
	rec_buff = ''
	send_at('AT+CGPS=1,1','OK',1)
	time.sleep(2)
	while rec_null:
		answer = send_at('AT+CGPSINFO','+CGPSINFO: ',1)
		client.publish("iiot/"+ myhost +"/gps", rec_buff, 0)
		if 1 == answer:
			answer = 0
			if ',,,,,,' in rec_buff:
				print('GPS no está listo')
				rec_null = False
				time.sleep(1)
		else:
			print('error %d'%answer)
			rec_buff = ''
			send_at('AT+CGPS=0','OK',1)
			return False
		time.sleep(1.5)


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_on(power_key)
	get_gps_position()
	#power_down(power_key)
except:
	if ser != None:
		ser.close()
	#power_down(power_key)
	GPIO.cleanup()
if ser != None:
		ser.close()
		GPIO.cleanup()