My GPRS module from seedstudio is not working properly with my arduino Mega.
We try to send AT commands to it through the D7/D8 (newsoft serial) and using an hardware UART (uart 1).
And the SIM900 doesn´t seem to respond to anything.
We have another module from sparksfun SM5100B and it seems to work with the hardware UART so i suppose that this is not an hardware problem on the Arduino Mega side.
I have searched on the forum and i found a big thread (http://www.seeedstudio.com/forum/viewtopic.php?f=4&t=2203) about the problem, but i didn´t understood if someone got to a solution for this problem.
Is this a problem with one lot of modules or is it a recurrent problem?
Does someone has any idea?