I2C is delicate, I too see

My first attempt at communications was going to be I2C, with the ArduIMU as a writing master, and the Nano as a reading slave. I had hoped that the 5V nano would be OK with the 3.3V magnetometer, but COMMs were never achieved, and it seems to have damaged the mag.
So, back to serial, while I wait for FedEx to bring my early xmas gift.

On the Nano is the ArduPilot 2.7.1 and COMMS are happening just fine.
Given that the 2.7.1 takes up 24886bytes of the Nano's 30720, the first step is extensive cutting back of any code that I know I won't use for now.
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