Add upload script.
Merge branch '19-bcom-in-c' into 20-standalone
Merge branch '20-standalone' into 21-bool
Merge branch '21-bool' into 22-printf
Merge branch '22-printf' into 23-wiring
Replace TX-2 with default.
Merge branch '19-bcom-in-c' into 20-standalone
Merge branch '20-standalone' into 21-bool
Merge branch '21-bool' into 22-printf
Merge branch '22-printf' into 23-wiring