mstanley:
dgelectron:
It seems to be a conflict between libraries Keypad and GSM...
Any idea how to solve it?I made a first attempt at including a namespace in the keypad library which I just attached below. I did this while at work so I haven't had a chance to test it out. If you want to use the attached copy of the keypad library then you will need to change the KeyState variables (IDLE, PRESSED, HOLD, or RELEASED) in your sketch to m_key::IDLE, m_key::PRESSED, m_key::HOLD, and m_key::RELEASED.
it works fine with me now, could you please how you make change to the keypad.h file