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Matter Over Thread on ESP 32 C6 Xiao by Seeed Studio in Arduino IDE#11777

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adm1nsys asked this question inQ&A
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Hello to everyone! Is it possible to run Matter Over Thread no WiFi in Arduno IDE?
I made code which enable BLE first setup and then it's Matter Over WiFi. It's like mix mode. Can I make Matter Over Thread?

#defineCONFIG_ENABLE_CHIPOBLE1 #defineCHIP_DEVICE_CONFIG_ENABLE_THREAD1#defineCHIP_DEVICE_CONFIG_ENABLE_WIFI0 #include<Matter.h>#include<Preferences.h>#include<platform/CHIPDeviceLayer.h>#include<platform/ConnectivityManager.h>usingnamespacechip::DeviceLayer;#include"esp_mac.h"// Matter endpoint: On/Off LightMatterOnOffLight OnOffLight;Preferences matterPref;#ifndef LED_BUILTIN#defineLED_BUILTIN2#endifconstuint8_t ledPin    = LED_BUILTIN;constuint8_t buttonPin = BOOT_PIN;// BOOTconstchar *nsName ="MatterPrefs";constchar *onOffKey ="OnOff";uint32_t btn_ts =0;bool btn_down =false;constuint32_t debounceMs =250;constuint32_t decommissionHoldMs =5000;boolsetLightOnOff(bool state) {digitalWrite(ledPin, state ? HIGH : LOW);  matterPref.putBool(onOffKey, state);returntrue;}voidprintMacs() {uint8_t mac[6];esp_read_mac(mac, ESP_MAC_WIFI_STA);  Serial.printf("WiFi STA MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",                mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);esp_read_mac(mac, ESP_MAC_WIFI_SOFTAP);  Serial.printf("WiFi AP  MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",                mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);}voidsetup() {  Serial.begin(115200);pinMode(ledPin, OUTPUT);pinMode(buttonPin, INPUT_PULLUP);ConnectivityMgr().SetWiFiStationMode(ConnectivityManager::kWiFiStationMode_Disabled);ConnectivityMgr().ClearWiFiStationProvision();printMacs();  matterPref.begin(nsName,false);bool last = matterPref.getBool(onOffKey,true);  OnOffLight.begin(last);  OnOffLight.onChange(setLightOnOff);  Matter.begin();if (!Matter.isDeviceCommissioned()) {    Serial.println("\n=== Matter over Thread (BLE commissioning) ===");    Serial.printf("Manual pairing code: %s\n", Matter.getManualPairingCode().c_str());    Serial.printf("QR code URL:        %s\n", Matter.getOnboardingQRCodeUrl().c_str());  }else {    Serial.printf("Resumed. Initial state: %s\n", OnOffLight.getOnOff() ?"ON" :"OFF");    OnOffLight.updateAccessory();  }}voidloop() {staticuint32_t lastNote =0;if (!Matter.isDeviceCommissioned() &&millis() - lastNote >5000) {    Serial.println("Waiting for commissioning…");    lastNote =millis();  }if (digitalRead(buttonPin) == LOW && !btn_down) {    btn_down =true;    btn_ts =millis();  }uint32_t dt =millis() - btn_ts;if (btn_down && dt > debounceMs &&digitalRead(buttonPin) == HIGH) {    btn_down =false;    OnOffLight.toggle();  }if (btn_down && dt > decommissionHoldMs) {    Serial.println("Decommissioning…");    OnOffLight.setOnOff(false);    Matter.decommission();    btn_ts =millis();  }}
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@SuGlider PTAL

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ESP32-C6: OpenThread init fails in Arduino Core 3.3.0 (IDF 5.5) due to missing eventfd/select in core build

Repro (ESP32-C6, Arduino Core 3.3.0 / IDF 5.5):

  • Boards Manager:Zigbee Mode = Off

  • build_opt.h:

    -DCHIP_DEVICE_CONFIG_ENABLE_WIFI=0-DCHIP_DEVICE_CONFIG_SOC_WIFI_SUPPORTED=0-DCHIP_DEVICE_CONFIG_ENABLE_THREAD=1-DCONFIG_ENABLE_CHIPOBLE=1-DINET_CONFIG_ENABLE_IPV4=0-DINET_CONFIG_ENABLE_IPV6=1

  • Core compile flags (.../esp32c6/flags/defines) include:

    -DOPENTHREAD_FTD=1-DOPENTHREAD_CONFIG_FILE="openthread-core-esp32x-ftd-config.h"

    butdo not include:

    -DCONFIG_VFS_SUPPORT_SELECT=1-DCONFIG_ESP_EVENTFD=1

Runtime:

E (xxxx) OPENTHREAD: esp_openthread_task_queue_init(...): Failed to create OpenThread task queue event fdE (xxxx) OPENTHREAD: esp_openthread_platform_init(...): esp_openthread_task_queue_init failedassert failed: modem_clock_device_disable modem_clock.c:236 (refs >= 0)

Hypothesis / root cause:
OpenThread port on ESP requireseventfd +select() (i.e.,esp_vfs_eventfd_register()) before OT init. The current Arduino core for ESP32-C6 appears to be builtwithoutCONFIG_VFS_SUPPORT_SELECT andCONFIG_ESP_EVENTFD, so OT init fails and the cleanup path trips the modem clock refcount assert.

Request:
Please provide a C6/H2 core build with the following Kconfig options enabled (preview/nightly is fine). I can test binaries immediately.

# 802.15.4 + OpenThreadCONFIG_IEEE802154_ENABLED=yCONFIG_OPENTHREAD_ENABLED=yCONFIG_OPENTHREAD_RADIO_NATIVE=yCONFIG_OPENTHREAD_FTD=y          # (or MTD if preferred)# VFS / eventfd (fixes the crash)CONFIG_VFS_SUPPORT_SELECT=yCONFIG_ESP_EVENTFD=y# Network for Matter over ThreadCONFIG_LWIP_IPV6=yCONFIG_LWIP_IPV4=n# Matter / CHIPCONFIG_ENABLE_MATTER_OVER_THREAD=yCONFIG_ENABLE_CHIPOBLE=y# Disable radio competitors in this buildCONFIG_ZB_ENABLED=nCONFIG_WIFI_ENABLED=n

Notes:

  • The presence of-DOPENTHREAD_FTD=1 inflags/defines shows OT libs are linked, but withouteventfd/select the platform init cannot create the task queue FD.
  • Target:ESP32-C6 (Thread via native 802.15.4), BLE on, Wi-Fi off, IPv6-only.
  • Happy to validate a preview Boards Manager package or drop-inesp32-arduino-libs archive.
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ESP-Matter code will select the Netowrk in a specific order: WiFi -> Thread -> ETH.
Given that C6 has WiFi enabled, it will always start it.

It is possible to create a C6 Matter Application using Arduino Matter API + Thread using Arduino as IDF Component.
Anyway anew issue has been create to track it.

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@adm1nsys

This is how Matter over Thread shall be bulit using the ESP32-C6:

1- Install IDF 5.5.0 into your computer. It can be done following the guide inhttps://docs.espressif.com/projects/esp-idf/en/stable/esp32c6/get-started/index.html

For Windows:https://docs.espressif.com/projects/esp-idf/en/stable/esp32c6/get-started/index.html
For Linux or MacOS:https://docs.espressif.com/projects/esp-idf/en/stable/esp32c6/get-started/linux-macos-setup.html

2- Test IDF with idf.py --version to check if it is installed and configured correctly. It shall outputESP-IDF v5.5

3- Clone the repository with the Arduino as IDF Component project.
git clonehttps://github.com/SuGlider/Arduino_ESP-Matter-over-Thread_ESP32-C6

4- Open an IDF terminal and execute idf.py set-target esp32c6

5- Execute idf.py -p <your COM or /dev/tty port connected to the ESP32-C6> flash monitor

6- It will build, upload and show the UART0 output in the screen.

7- Try to add the Matter RGB light to your Matter environment.

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For the records, there is a Matter over Thread example for C6/C5/H2 in
https://github.com/espressif/arduino-esp32/tree/master/idf_component_examples/Arduino_ESP_Matter_over_OpenThread

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