查看树莓派实战GPRS的源代码

==SIM800 GPRS/GSM==

老牌GPRS芯片, 所以兼容性好. Arduino 都有很好的支持, 更不用说数梅派这种Linux操作系统的.

==树梅派串口环回==

数梅派上使用SIM800的主要问题是串口经常被占用. 而且系统很复杂, 多种渠道会占用唯一的硬件串口资源. 一旦串口能正常工作, 在数梅派上使用SIM800是一件很轻松的事情.


==简单AT命令==

=== 查询SIM卡状态===
 at+cpin?

===查询网络状态===
 At+cops?

 +cops 0,0，“Chian mobile”

===读取国际识别码===

 AT+CIMI


===发送短消息===
 > AT+CMGF=1                                                   	 
 OK
 > AT+CMGS="+861533xxxx3"                                                   	 
 > test sms                                                                 	 
 > ctl+z                                                                         	 
 +CMGS: 0          


=== TCP 连接===
<source>
at+cipstart="tcp","api.thingspeak.com","443"

AT+cipDI=0

at+cipsend

>  POST /update?api_key=5J9GD27HXIMASDRC&field1=5000&headers=false  HTTP/1.1

>GET /update?api_key=

at-cipshut
</source>

[https://github.com/carrascoacd/ArduinoSIM800L  sim800 Arduino HTTP]


[https://www.rhydolabz.com/wiki/?p=16325   PPP Via Sim800 modem]


==串口拨号==

[https://www.rhydolabz.com/wiki/?p=16325  教程]

<source lang="bash">
sudo apt-get install ppp screen elinks

ls /etc/ppp/peers/

sudo vim /etc/ppp/peers/gprs
</source>




==默认路由==

ppp 已经设置了默认路由.

<source lang="bash">

<source>

==启动deamon程序==

<source lang="bash">

#Start daemon
sudo start-stop-daemon --start -b --pidfile /run/ppp --startas /usr/bin/pon gprs

#More easy and dirty way
sudo setsid ./start-lora > /dev/null 2>&1 < /dev/null &

cat start-lora
#!/bin/bash
cd /home/pi/loraGW/
./lora_gateway_pi2 --mode=2|python ./post_processing_gw.py >>/var/log/lora

</source>