I2C connection randomly fails on P1 & Photon

[bko]

Hi @Pascal

You could try the work-around described over here:

Photon FW 4.4: i2c not reliable

Hi @hl68fx The STM32F205 processor errata says there are problems with i2c and the 0.4.4 has the work-arounds that Particle thought would be the best, but there still could be problems, particularly with multiple i2c devices over a long period. The battery gauge thread also shows some problems even with 0.4.4. Another user reported that they could get out of the bad state by doing this when it gets stuck: Wire.beginTransmission(deviceAddress); Wire.endTransmission(); Any interest in trying …

Some users are reporting better-but-not-perfect results by doing this begin/end when there is a problem.