I have connected a new Itead sim800 board to a Raspberry Pi 4 Model B and trying to handle incoming SMS. I have disabled the serial login shell using the link and tried gammu and minicom(with /dev/ttyAMA0, /dev/serial0 & /dev/serial1 on baud rate 9600).
But the board doesn't seem to be responding. Following is the result of gammu.
pi@tpk:~ $ sudo gammu getallsms
No response in specified timeout. Probably the phone is not connected.
pi@tpk:~ $
Following is the result of minicom:
pi@tpk:~ $ sudo minicom -D /dev/ttyAMA0 -b 9600
Welcome to minicom 2.7.1
OPTIONS: I18n
Compiled on Aug 13 2017, 15:25:34.
Port /dev/ttyAMA0, 04:46:20
Press CTRL-A Z for help on special keys
and the console hangs without accepting any characters. The status line at the bottom shows that it's offline.
Following is the snap of the boards connected. sim800 board on raspberry pi 4
