Wire.endTransmission() return values

[system]

this is not documented at the wire library reference Wire - Arduino Reference

Wire.endTransmission(); has different return values

• 0 .. success
• 1 .. length to long for buffer
• 2 .. address send, NACK received
• 3 .. data send, NACK received
• 4 .. other twi error (lost bus arbitration, bus error, ..)

according to twi.c