How to: Use esphome as RS485 to Wifi bridge

[DerTiger1]

It is possible to bridge the serial connection over Wifi to a virtual COM-Port and to use the Samsung S-Net software for remote controlling your HVAC Unit:

1. Add https://github.com/oxan/esphome-stream-server to your esphome yaml:
   external_components:
   • source: github://oxan/esphome-stream-server
     stream_server:
2. Compile and upload
3. Install a virtual COM-port driver (e.g.: https://www.hw-group.com/software/hw-vsp3-virtual-serial-port)
4. Start the virtual COM-Port and make sure that "NVT enabled" is unchecked under settings and make sure to set the port to 6638 (which is default of oxan/esphome-stream-server)
5. Connect with the Samsung S-Net Software using the option F1/F2 (to change COM-Port you have to click on the "hearbeat" icon in the upper left)
   S-Net NASA (new protocol) systems: https://www.samsunghvac.com/Software-Downloads/SNET-Pro2
   S-Net non NASA systems: https://www.samsunghvac.com/Software-Downloads/SNET-Pro

Edit: Sometimes it takes time until the connection is established - disconnect and re-connect helps.
Don't try anything until you see a window like this:

Enjoy

[lanwin]

Thank you.

[bzumik1]

@DerTiger1 that is great to know, thanks a lot!

[lanwin]

Do you see a way to log the data that is written thru the virtual COM port?

[DerTiger1]

Do you see a way to log the data that is written thru the virtual COM port?

A long time ago we were using serial sniffers for this but I can't find any software that is free to use.
As the packets should be the RAW RS485 data I managed to record them using wireshark with a filter on the specified TCP Port of the serial to wifi connection.