Sample code for SIM800L and schematics

[ebelingtec]

Hello Anthonio,

you cannot make it work by changing the pins ins "HardwareSerial.cpp" only. You need to get wires and physically reconnect (see picture):

In "HardwareSerial.cpp" : RX2 34 and TX2 13

I had to rewire the gsm module physically. In Header 5 (P4) I switched GSM_RX and GSM_TX