added gps.py

gps.py

@@ -0,0 +1,98 @@
+#!/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()
+
+power_key = 6
+rec_buff = ''
+rec_buff2 = ''
+time_count = 0
+
+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:
+			print(rec_buff.decode())
+			return 1
+	else:
+		print('GPS is not ready')
+		return 0
+
+def get_gps_position():
+	rec_null = True
+	answer = 0
+	print('Start GPS session...')
+	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", answer)
+		if 1 == answer:
+			answer = 0
+			if ',,,,,,' in rec_buff:
+				print('GPS is not ready')
+				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()