98 lines
2.0 KiB
Python
98 lines
2.0 KiB
Python
#!/usr/bin/python
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# -*- coding:utf-8 -*-
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import RPi.GPIO as GPIO
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import paho.mqtt.client as mqtt
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import serial
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import time, os
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# MQTT Broker settings
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mqttBroker ="65.108.199.212"
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myhost = os.uname()[1]
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client = mqtt.Client(myhost)
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client.connect(mqttBroker, 1883)
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ser = serial.Serial('/dev/ttyS0',115200)
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ser.flushInput()
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power_key = 6
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rec_buff = ''
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rec_buff2 = ''
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time_count = 0
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def send_at(command,back,timeout):
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rec_buff = ''
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ser.write((command+'\r\n').encode())
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time.sleep(timeout)
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if ser.inWaiting():
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time.sleep(0.01 )
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rec_buff = ser.read(ser.inWaiting())
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if rec_buff != '':
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if back not in rec_buff.decode():
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print(command + ' ERROR')
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print(command + ' back:\t' + rec_buff.decode())
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return 0
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else:
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print(rec_buff.decode())
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return 1
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else:
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print('GPS is not ready')
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return 0
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def get_gps_position():
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rec_null = True
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answer = 0
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print('Start GPS session...')
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rec_buff = ''
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send_at('AT+CGPS=1,1','OK',1)
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time.sleep(2)
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while rec_null:
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answer = send_at('AT+CGPSINFO','+CGPSINFO: ',1)
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client.publish("iiot/"+ myhost +"/gps", answer)
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if 1 == answer:
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answer = 0
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if ',,,,,,' in rec_buff:
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print('GPS is not ready')
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rec_null = False
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time.sleep(1)
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else:
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print('error %d'%answer)
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rec_buff = ''
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send_at('AT+CGPS=0','OK',1)
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return False
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time.sleep(1.5)
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def power_on(power_key):
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print('SIM7600X is starting:')
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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GPIO.setup(power_key,GPIO.OUT)
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time.sleep(0.1)
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GPIO.output(power_key,GPIO.HIGH)
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time.sleep(2)
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GPIO.output(power_key,GPIO.LOW)
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time.sleep(20)
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ser.flushInput()
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print('SIM7600X is ready')
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def power_down(power_key):
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print('SIM7600X is loging off:')
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GPIO.output(power_key,GPIO.HIGH)
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time.sleep(3)
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GPIO.output(power_key,GPIO.LOW)
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time.sleep(18)
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print('Good bye')
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try:
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power_on(power_key)
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get_gps_position()
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power_down(power_key)
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except:
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if ser != None:
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ser.close()
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power_down(power_key)
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GPIO.cleanup()
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if ser != None:
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ser.close()
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GPIO.cleanup() |