Burn-bootloader does not work with RP2040 boards added

[dtomcat]

Describe the problem

Trying to burn bootloader to atmega32u4; but fails because trying to kill process discovery = rp2040. when I remove that board type, It functions perfectly.

To reproduce

install Rapsberry pi pico/RP2040 board types by "Earle F. Philhower, III" and try to burn a bootloader.

Expected behavior

Should burn the bootloader to the atmega32U4

Arduino CLI version

1.0.2

Operating system

Windows

Operating system version

Latest updates

Additional context

INFO[0007] Executing `arduino-cli burn-bootloader`
ERRO[0008] Killing discovery process: TerminateProcess: Access is denied.  discovery=rp2040
ERRO[0008] Waiting discovery process termination: exit status 0xc0000409  discovery=rp2040
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x8 pc=0xbe7f5e]

goroutine 44 [running]:
github.com/arduino/pluggable-discovery-protocol-handler/v2.(*Client).Run(0xc0001f8870)
        /go/pkg/mod/github.com/arduino/pluggable-discovery-protocol-handler/[email protected]/client.go:281 +0x19e
github.com/arduino/arduino-cli/internal/arduino/discovery/discoverymanager.(*DiscoveryManager).startDiscovery(0xc000244050, 0xc0001f8870)
        /home/build/internal/arduino/discovery/discoverymanager/discoverymanager.go:203 +0x95
github.com/arduino/arduino-cli/internal/arduino/discovery/discoverymanager.(*DiscoveryManager).Start.func2(0x736169626f742f6d?)
        /home/build/internal/arduino/discovery/discoverymanager/discoverymanager.go:105 +0x3c
created by github.com/arduino/arduino-cli/internal/arduino/discovery/discoverymanager.(*DiscoveryManager).Start in goroutine 1
        /home/build/internal/arduino/discovery/discoverymanager/discoverymanager.go:104 +0x1ae

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details

[cmaglie]

I think I've identified the issue, I'm preparing a fix for this problem.

[cmaglie]

@dtomcat
if you can still reproduce the issue, may you test the arduino-cli build here (scroll down at the bottom of the page): https://github.com/arduino/arduino-cli/actions/runs/10849485867?pr=2707

It contains a fix for the pluggable-discovery client.

[dtomcat]

I’ve disassembled the setup and have a few projects… I’m not sure when I’ll have time… but can definitely give it a go when I do have the time if someone else hasn’t done so. Thank you for the fix!