no signal on USB-only eBUS Adapter Shield C6 Stick Edition

[arnaudpn]

Hello,

I just bought a USB-only eBUS Adapter Shield C6 Stick Edition which gets recognized correctly by HAOS:

[402858.821291] usb 1-1.3: new full-speed USB device number 3 using xhci_hcd
[402858.916632] usb 1-1.3: New USB device found, idVendor=303a, idProduct=1001, bcdDevice= 1.02
[402858.916664] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[402858.916676] usb 1-1.3: Product: USB JTAG/serial debug unit
[402858.916687] usb 1-1.3: Manufacturer: Espressif
[402858.916695] usb 1-1.3: SerialNumber: 58:E6:C5:F6:A1:8C
[402858.964414] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device
[402858.964666] usbcore: registered new interface driver cdc_acm
[402858.964679] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

eBUSd starts correctly:

[15:46:53] INFO: ebusd --foreground --updatecheck=off --mqtthost=core-mosquitto --mqttport=1883 --mqttuser=<redacted> --mqttpass=<redacted> --mqttjson --mqttint=/config/mqtt-hassio.cfg --device=enh:/dev/ttyACM0 --mqttjson --scanconfig --log=all:notice 
2026-03-20 15:46:53.376 [device notice] transport opened
2026-03-20 15:46:53.380 [main notice] ebusd 26.1.26.1 started with broadcast scan on device: /dev/ttyACM0, serial speed, enhanced
2026-03-20 15:46:53.601 [bus notice] bus started with own address 31/36
2026-03-20 15:46:53.602 [device notice] reset, supports info
2026-03-20 15:46:53.604 [mqtt notice] connection established

Note that I obtain the same result when using serial high speed (--device=ens:/dev/ttyACM0)

It's well connected on the eBus of my Vaillant Heating system and the green led is quickly & constantly blinking meaning it should see activity on the bus.

Logs when plugging and unplugging the USB stick shows information regarding the signal (acquired then quickly lost) though:

2026-03-21 11:12:44.968 [device error] transport closed
2026-03-21 11:12:44.968 [bus notice] device invalid
2026-03-21 11:12:49.971 [device notice] transport opened
2026-03-21 11:12:49.971 [bus notice] re-opened /dev/ttyACM0
2026-03-21 11:12:54.347 [bus notice] signal acquired
2026-03-21 11:12:54.347 [device notice] reset, supports info
2026-03-21 11:12:56.007 [bus error] signal lost

However it seems it cannot acquire the signal :

root@b4d7ad18-ebusd:/# ebusctl info
version: ebusd 26.1.26.1
device: /dev/ttyACM0, serial speed, enhanced
signal: no signal
reconnects: 0
masters: 1
messages: 17
conditional: 0
poll: 0
update: 10
address 31: master #8, ebusd
address 36: slave #8, ebusd

Could it be that it's defect (hardware level) or that I missed something obvious ?

Thank you !
Arnaud.

[arnaudpn]

Wrong place for this discussion.
Closing in duplicated of john30/ebusd-esp32#161

[arnaudpn]

It's resolved. Cf. link above.
Sorry for the noise.