I found simple way that almost work (when PDU not needed):
got answer something like thisUSSD message e.g balance check one shall execute
# echo "AT+CUSD=1,*101#^M" > /dev/ttyUSB1; cat /dev/ttyUSB1
IMPORTANT: ^M (Carriage Return character) is typed as CTRL+v and CTRL+m
code not supported
Checked AT codes with minicom - it works fine, answer is correct, but I want just simple script to do prepaid balance check.
Is there error in this script?
^M (Carriage Return character) looks suspicious, or I do something wrong
Anyone help?