Interface Node-RED with arduino

Im developing a project in node-red that has the input of a numbpad. I'm now trying to test it with Arduino Uno and a keypad 4x4. I´ve tried StandartFirmata and tried to modify it to work with keypad but was unsuccessful. Does anyone know of a sketch of StandartFirmata with a Keypad 4x4 included?
Thanx for your time :smiley: !!

Ok i have identified the problem. When arduino tries to send 2 signals, non of them are read! I can only receive the coloum or the row, if i try to press "1" (pins 9 and 5) and have both connected on node-red it wont receive payload, as if i only have one of them connected in Node-RED i get the one i have connected!

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