I have been struggling to get get uart working properly on a Raspberry Pi 3. I have looked at these two posts (Serial port usage and Serial port on Raspberry Pi 3) pretty extensively and tried everything suggested to no avail unfortunately.
I used our own application and the serial test repo to test that the command is being sent. In the output of the process I see hundreds of newlines then “[device uuid] login: Login incorrect” then hundreds more (maybe 600) new lines. It seems like perhaps this is a result of another resin process using the port? Someone from resin stated that that shouldn’t happen in one of the above forum posts, but it seems like something strange is happening there.
Most recently, I followed what was in this comment and the one below it, with the same results (although very occasionally it does output the message, but usually does what is described above).
For reference, here are the settings for the device:
And in /resin-boot/config.txt, I added:
Other potentially useful info:
Resin OS 2.3.0+rev1 (dev)
Any help/guidance would be greatly appreciated.