From 3825102c4379884db29cdc0913880c065f973af9 Mon Sep 17 00:00:00 2001
From: Adolfo Delorenzo <adelorenzo@oe74.net>
Date: Tue, 16 Jul 2024 03:00:37 +0000
Subject: [PATCH] Add gps01.py

---
 gps01.py | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 gps01.py

diff --git a/gps01.py b/gps01.py
new file mode 100644
index 0000000..9deb602
--- /dev/null
+++ b/gps01.py
@@ -0,0 +1,142 @@
+#!/usr/bin/python
+# -*- coding:utf-8 -*-
+import RPi.GPIO as GPIO
+import paho.mqtt.client as mqtt
+import serial
+import time, os
+import csv
+from datetime import datetime
+
+# 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
+
+# CSV file settings
+csv_filename = f"gps_data_{myhost}.csv"
+csv_headers = ["Timestamp", "Latitude", "Longitude"]
+
+def convert_to_decimal(coord_str):
+    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:])
+    
+    decimal = degrees + (minutes / 60)
+    
+    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}", f"{lon:.6f}"
+
+def write_to_csv(lat, lon):
+    timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+    with open(csv_filename, mode='a', newline='') as file:
+        writer = csv.writer(file)
+        writer.writerow([timestamp, lat, lon])
+
+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)
+            lat, lon = parse_gps_data(gps_data)
+            converted_gps = f"{lat}, {lon}"
+            print("Converted GPS data for Google Maps:", converted_gps)
+            client.publish("iiot/"+ myhost +"/gps", converted_gps)
+            write_to_csv(lat, lon)
+            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')
+
+# Create CSV file with headers if it doesn't exist
+if not os.path.exists(csv_filename):
+    with open(csv_filename, mode='w', newline='') as file:
+        writer = csv.writer(file)
+        writer.writerow(csv_headers)
+
+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()
\ No newline at end of file