It seems there is an issue with Travis and from what I can narrow it down to has to do with DNS Multicasts causing a Java Error on M4 builds (all examples). However, it builds and runs just fine on the Arduino IDE. I noticed Travis was updated to use Arduino 1.8.9 instead of 1.8.7, but there could have been other updates as well. This issue is more of a reminder to rebuild once that issue is fixed. Alternatively, we could add a test skip for the M4 until then.
It seems there is an issue with Travis and from what I can narrow it down to has to do with DNS Multicasts causing a Java Error on M4 builds (all examples). However, it builds and runs just fine on the Arduino IDE. I noticed Travis was updated to use Arduino 1.8.9 instead of 1.8.7, but there could have been other updates as well. This issue is more of a reminder to rebuild once that issue is fixed. Alternatively, we could add a test skip for the M4 until then.