sim800l.md
Introduction

sim800l can be connected to an Arduino in order to transmit data on GPRS.

The library 'TinyGSMClient' seems really good and works with LilyPad USB.

We need to take care about the sim card so that the cutted edge point towards
outside of the holder !!!!

We should provide power between 3.4 and 4.4v. LiPo battery is of course optimal.
Here is the description of the connection between a master-simple and the sim800l.



sim800l seems not to provide HTTPS.

We have created a simple test link: <![CDATA[]]>http://www.cheminfo.org/hello.txt<![CDATA[]]> that allows to check the connection.

We still need to create a webservice to add data in the database and we didn't try yet MQTT.

testing sim800l


AT
AT+CMEE=2 : Enable long debug
AT+CFUN=1 : Enable full functionality
AT+CFUN? : check CFUN
AT+CPIN? : Connect without pin code
AT+CSTT="sunrise","","" : connect to APN
AT+CIICR : start wireless connection
AT+COPS=? : List available networks
AT+CIFSR : get IP address


AT+CIPSTART="TCP","ch4.chemexper.com",80
AT+CIPSEND=22
GET /test HTTP/1.0


AT+COPS? : List connected network


Get coordinates and date

AT+CGATT =1 // to attach GPRS.
AT+SAPBR =3,1,”CONTYPE”,”GPRS” //activate bearer profile.
AT+SAPBR =3,1,”APN”,”RCMNET”
AT+SAPBR=1,1
AT+SAPBR=2,1
AT+CIPGSMLOC=1,1 //to get gsm location, time and date.
AT+CIPGSMLOC=2,1 //to get gsm time and date
AT+SAPBR =0,1 //to deactivate bearer profile.