companion-module-requests
                                
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                        RGBlink mini or Livepro L1
It's a simple 4 chanel hdmi video mixer. Will be nice to switch chanel over Companion It have an Ethernet app to control it, but i didn't find the API This is the product web page: https://rgblink.com/product-detail?id=1081#!/tab/56140311-2
This is the same product, but from another brand: http://www.feelworld.cn/ShowInfo.aspx?id=667&py=FEELWORLD-LIVEPRO-L1-Multi-format-Video-Mixer-4-x-HDMI-inputs-multi-camera-production-real-time-live-streaming Maybe it helps
Hello. I asked for API from manufacturer, and he send me the API instructions. Now I'm digging other functions, that are not mentioned in this document. API(EN).pdf
I had the same need for TAO1 Pro, looks like API is built in the same way. Although it's not implemented nicely as a module, I managed to trigger the channel switch by using companion generic TCP/UDP module https://github.com/bitfocus/companion-module-generic-tcp-udp you set the IP of your device, port to 1000 and UDP in the module configuration then on the buttons configurations you send one of the command in the API
- Switch to signal source 1 send : <T0000750200000077>
- Switch to signal source 2 send <T0000750200010078>
- Switch to signal source 3 send : <T0000750200020079>
- Switch to signal source 4 send: <T000075020003007A>
hope this helps
Stream deck + Feelworld Livepro L1 Switching cameras commands using companion generic TCP/UDP module. Set the IP of your device, port to 1000 and UDP in the module configuration then on the buttons configurations you send one of the command(just what's after the colon) bellow:
Switching camera 01 - add command bellow:
<T0000750200000077>
Switching camera 02 - add command bellow:
<T0000750200010078>
Switching camera 03 - add command bellow:
<T0000750200020079> 
Switching camera 04 -add  command bellow:
<T000075020003007A>
Together with a friend, we have created a module for RGBlink mini - https://github.com/bitfocus/companion-module-rgblink-mini. Currently it's available in Beta Build.