How debug CHIP core with Arduino Nano Matter

[sebmalissard]

Hello,

I have an Arduino Nano Matter board that was working fine at the beginning. I completed commissioning, loaded several examples, and erased the nvm3 with Home Assistant. But now, I'm completely stuck because commissioning works fine, but the device always appears offline on the Home Assistant side, with the error: "CASESession timed out while waiting for a response from the peer. Current state was 4." However, I can ping the device so Thread Network seems correct. I have other Matter/Thread devices that continue to work normally.

I suspect an issue on the Arduino Nano Matter side. So my question is: how can we enable Chip logs in the Serial console or through another method?

[silabs-bozont]

Hey @sebmalissard,
You can get RTT output from the Nano Matter with OpenOCD.

Launch a server:
/Users/bozont/Library/Arduino15/packages/SiliconLabs/tools/openocd/0.12.0-arduino1-static/bin/openocd -s /Users/bozont/Library/Arduino15/packages/SiliconLabs/tools/openocd/0.12.0-arduino1-static/share/openocd/scripts/ -f interface/cmsis-dap.cfg -f target/efm32s2_g23.cfg -c "init; rtt setup 0x20000000 0x40000 \"SEGGER RTT\"; rtt start; rtt server start 9090 0"
(change the core path according to your OS)

Telnet into it:
telnet 127.0.0.1 9090

Enjoy the RTT output:

[00:00:00.000][silabs ]==================================================
[00:00:00.000][silabs ]Arduino Matter device starting
[00:00:00.000][silabs ]==================================================
[00:00:00.000][silabs ]Init CHIP Stack
[00:00:00.000][info  ][DL] Setting device name to : "Arduino Matter device"
[00:00:00.000][silabs ]Initializing OpenThread stack
[00:00:00.000][info  ][DL] OpenThread ifconfig up and thread start
[00:00:00.000][info  ][DL] OpenThread started: OK
[00:00:00.000][info  ][DL] Setting OpenThread device type to ROUTER
[00:00:00.000][silabs ]Starting OpenThread task
[00:00:00.000][info  ][SVR] Subscription persistence not supported
[00:00:00.000][info  ][SVR] Server initializing...
[00:00:00.000][detail][FP] Initializing FabricTable from persistent storage
[00:00:00.000][info  ][TS] Last Known Good Time: 2024-02-22T22:53:30
[00:00:00.000][info  ][FP] Fabric index 0x1 was retrieved from storage. Compressed FabricId 0xFDC53ED7C3673087, FabricId 0xD5F1E5AD0F7B4FCC, No[00:00:19.290][info  ][DL] _OnPlatformEvent default:  event->Type = 32777
[00:00:19.290][detail][DL] OpenThread State Changed (Flags: 0x00000064)
[00:00:19.290][detail][DL]    Device Role: ROUTER

[sebmalissard]

Thank you, it works perfecty. Now I will look these logs :-)

For information, I am on Windows, I adapted the command as follows:
C:\Users\Seb\AppData\Local\Arduino15\packages\SiliconLabs\tools\openocd\0.12.0-arduino1-static\bin\openocd.exe -s C:\Users\Seb\AppData\Local\Arduino15\packages\SiliconLabs\tools\openocd\0.12.0-arduino1-static\share\openocd\scripts -f interface/cmsis-dap.cfg -f target/efm32s2_g23.cfg -c "tcl_port 100789" -c "init; rtt setup 0x20000000 0x40000 \"SEGGER RTT\"; rtt start; rtt server start 9090 0"
Note: I changed the default tcl_port 6666 which seem blocked by the firewall.