See the RFX MQTT User Guide chapter 6.2

Install a MQTT broker,
Flash RFX433EMC_MQTT_WiFi in the RFX-433EMC. (chapter 3)
Configure WiFi in the RFX-433EMC (chapter 4.3)
Configure MQTT and the 433 protocols in the RFX-433EMC. (chapter 7)

Do you use the firmware in the RFXtrx433 that supports the FT007TH?
See the RFXtrx user guide.

And test with RFXmngr.

Please check the supported device list in the RFXtrx User Guide.
In this list you will see which firmware supports the FT007TH.
If you own the very old RFXtrx433 you need EXT2 firmware.

Conrad FT007TH.
This temp/hum sensor has a display and 8 channels.

Enable the Oregon protocol.
The very old (>10Yr) RFXtrx433 doesn't support this sensor.
Use Pro1 firmware in the RFXtrx433E.
All firmware of the RFXtrx433XL and RFX433XL supports this sensor.

The FT007TH could be used. This sensor has up to 8 fixed channels.
https://www.conrad.nl/nl/p/renkforce-ft ... 25532.html

gizmocus told you: "configure domoticz to not accept new hardware/devices in the settings"
This will avoid adding unknown sensors.

Delete all Ecowitt devices except 74B1

Domotics software needs an update to show the other sensors with the same ID 74B1:
ID = 74B1 decimal:29873
Direction = 166 ...

Use the latest 2049 firmware.
There was an update in 2048: http://blog.rfxcom.com/?p=334

I bought this Rain Gauge: TFA 30.3233.01

I am running Domoticz 2024.4 on a Raspberry Pi with receiver RFXcom433XL with ProXL1 1043 firmware
According the manual this receiver should support the Rain Gauge
http://www.rfxcom.com/WebRoot/StoreNL2/Shops/78165469/MediaGallery/Downloads/RFXtrx_User ...

These protocol/sensors can be used by the RFX868XL:
- Alecto ACH2010
- Alecto WS5500, FineOffset WH2900,
- Ventus W830
- Davis Vantage Vue EU
- Ecowitt WH31,WN32,WH40,WH57,WS90,WH5360
- Edisio
- FS20
- Gaposa rollermotor
- Honeywell ActiveLink
- Itho CVE RFT
- Itho CVE ECO RFT
- Keeloq (unencrypted ...

The latest RFX433XL firmware version 2032 and RFXmngr 19.0.0.57 support the down+stop/My > 2 seconds command.
The files are available on the RFXCOM Downloads page

contact support rfxcom.com

Up-Down is possible with RFXCOM, see the screen above!

@tomtw: I'm RFXCOM support

It is not possible to transmit a RAW RFY command.
The available RFY commands are pre-programmed in the RFX firmware and a new command would need a firmware update.

Why do you need an ‘up/down > 2 sec’ command?
Maybe better to contact RFXCOM support?

I suppose Orcon is supported by Domoticz with the RFXCOM RFX868XL

You can also add new RFY devices in the other RFX433.
Important use another ID and pair this as an additional remote on the Somfy motor.

No problem to have the serial and LAN RFXCOM on your Domoticz system.
If required you can move the Somfy RTS devices from the RFXtrx-USB to the RFX433-LAN, see the RFXtrx User Guide.

Flashing is removed on purpose.
There are no more firmware updates planned for the old RFXtrx433 and RFXtrx433E transceivers.
At RFXCOM we received too many problem calls from users that flashed the RFXtrx433XL or RFX433XL with Domoticz despite all the warnings.

RFX433 firmware is updated to correct a major problem for ASA, Somfy RTS, Cherubini and OZroll.
Please see blog.rfxcom.com

Flash with RFXflash!!!!

Add Manual Light/Switch Device
Hardware: RFX433
Switch Type: Blinds
Type: Brel DDxxxx