Problem connecting HMS-2000-4T to OpenDTU with CMT2300A (Spain, 868 MHz)

[piKolin]

Hi everyone,

I've built a custom OpenDTU using an ESP32 and an Ebyte CMT2300A module to communicate with Hoymiles HMS-2000-4T microinverters Link.

I'm located in Spain, and I'm using a LoRa 868 MHz IPEX antenna Link.

The problem

The OpenDTU boots fine, but it doesn't detect the HMS microinverters at all. In the logs I keep seeing:

[19:17:24.660] W (116026) hoymiles: All missing
[19:17:24.660] W (116029) hoymiles: Nothing received, resend whole request
[19:17:24.660] D (116035) hoymiles: TX RealTimeRunData 868.00 MHz --> 15 ...
[19:17:24.660] I (116154) hoymiles: Fetch inverter: 1164...
[19:17:24.660] I (116160) hoymiles: Queue size - NRF: 0 CMT: 4
[19:17:24.660] I (116589) hoymiles: RX Period End
[19:17:25.620] W (116593) hoymiles: All missing
[19:17:25.620] W (116596) hoymiles: Nothing received, resend count exeeded
[19:17:25.620] V (116643) temperature: Raw temperature value: 163
[19:17:25.620] D (116747) hoymiles: TX AlarmData 868.00 MHz --> 15 ...
[19:17:25.620] I (117552) hoymiles: RX Period End
[19:17:26.580] W (117556) hoymiles: All missing
[19:17:26.580] W (117559) hoymiles: Nothing received, resend whole request

Everything appears correctly soldered and configured:

Is there any firmware version that supports passive scan or monitor mode with the CMT2300A, so I can check whether my HMS microinverters are transmitting at all?

I’d like to verify if they’re actually sending any data, in case they are already paired with a DTU or not in pairing mode.

Thanks a lot for any guidance or suggestions!

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