"arduino-cli upload" ignores port setting in "sketch.json"

[ShyLionTjmn]

i have sketch.json:

{ "cpu": { "fqbn": "arduino:avr:pro", "port": "/dev/ttyUSB0" } }

Still, every time i run "arduino-cli upload" i have to add "-p /dev/ttyUSB0" option.
Am i doing something wrong?

[davegarthsimpson]

Hi @per1234 are there any further actions on this?

[per1234]

@davegarthsimpson the problem is that the previous sketch.json system requires a URI style protocol+port format like serial:///dev/ttyUSB0. @ShyLionTjmn must have manually added the unsupported port format into the cpu.port field of the file, since if board attach --port is used, the port has the correct format. Unfortunately, Arduino CLI does not communicate the problem to the user.

This problem will be resolved by the pending complete reworking of the board attach command in #1930, which adds support for the more familiar /dev/ttyUSB0 port format supported by all Arduino CLI's --port flags. That change also means the port is passed directly to the upload tool rather than parsing it for a protocol (there is a dedicated flag and field for the protocol), so the user would likely receive a more meaningful error from the upload tool in the event they specify a port of an invalid format in the file.