I want to make a call & send ASCII characters via a GSM modem.
Can this be done using SIM900A GSM modules?
I don't want to do this by sending SMS AT commands.
I want to do this by making a call & send characters not from SMS.
In simply I want to control 4 relays wirelessly using two GSM modules.
Can this be done using SIM900A GSM modules?
I don't want to do this by sending SMS AT commands.
I want to do this by making a call & send characters not from SMS.
In simply I want to control 4 relays wirelessly using two GSM modules.