Hi,
I have integrated my EMMA into Home Assistant using the huawei_solar integration.
The integration works and I can see about 70 sensors plus the EMMA device itself.
However, I do not see any sub-devices that belong to the EMMA’s Modbus slave chain.

My system topology looks like this:

Plant
├─ EMMA-A02 (Master, WLAN Modbus TCP)
│ ├─ SUN2000-10K-MAP0 (slave)
│ │ ├─ LUNA2000-10KW-C1 + LUNA2000-7-E1 (battery stack)
│ │ └─ 21 x Optimizers
│ └─ SmartGuard-63A-T0

I would like to access the inverter, the battery and the optimizers as individual devices in HA — not only the EMMA-level sensors.

Question:
Do I need to install a Huawei Smart Dongle WLAN-FE A-05 on my SUN2000-10K-MAP0 inverter (which is currently a Modbus slave behind the EMMA) in order to expose the inverter over Modbus-TCP and make it available to Home Assistant?

Right now, the inverter does not show any Modbus-TCP or dongle configuration options in FusionSolar. I can only change the RS485 bus baud rate, which suggests that EMMA is the only active Modbus master.

I would like to confirm whether the integration can access slave devices behind EMMA at all, or whether a Smart Dongle on the inverter is required for full access to inverter/battery/optimizer registers.

I've seen issues/943, that in general it should be possible to have all devices over EMMA Modbus TCP connection.

Thanks!