[MainUI] Offer assistance for parameters wtih context `serial-port`

[dilyanpalauzov]

Some config parameters for things have <context>serial-port</context>. The Serial Bridge of the Alarm Decoder binding under “Serial Or USB Port“ has such context.

• Main UI should offer assistance, e.g. in form of auto-completion, drop down, of all possible values of serial ports. This will make it for the user easier to select the right endpoint. In addition, if a device is not reported here, this is an indication that the problem is in OH-core (-Dgnu.io.rxtx.SerialPorts=/dev/abc is not passed; bad permissions for /dev/xyz), and not in the binding.

The list of available devices is reported by org.openhab.core.io.transport.serial.SerialPortManager.getIdentifiers().

[jsjames]

This would be good, but I believe core would need to provide the list through the rest API as a first step, correct?

[dilyanpalauzov]

I don’t know how it works, but when the webpage for the thing configuration is rendered, the http-server could generate a list of serial devices, put this list in the generated html, and send it this way to the browser. This way core does not have to announce the serial devices over REST endpoint.

Concerning the actual UI, apart from autocompletion, this can be offered also as radio buttons.