Simplify trigger logic to port-only matching and improve Samsung detection

README.md

@@ -4,34 +4,26 @@ FastAPI dashboard and polling service for Alienware-only KVM switching.
 
 ## Trigger Logic
 
-The Samsung monitor is trigger-only and uses fixed input codes:
+The app targets Alienware AW3423DWF for switching and uses Samsung as trigger-only.
 
-- Tower trigger: `15`
-- Laptop trigger: `19`
+Monitor filtering:
 
-Each installation of this tool is for one device only. The UI lets you choose:
+- Alienware target monitor: description contains `AW3423DWF`
+- Samsung trigger monitor: Samsung-only descriptions (`SAM...` / `SAMSUNG`)
+- Other non-Alienware DDC monitors are ignored for trigger selection
 
-- this device role: `tower` or `laptop`
-- this device Alienware target port:
+Configure only one value per machine:
 
-- `DP1`
-- `DP2`
-- `HDMI`
+- this device Alienware target port: `DP1`, `DP2`, or `HDMI`
 
-The device role can also still be provided by:
+Samsung trigger input codes mapped by port:
 
-- environment variable `KVM_DEVICE_ROLE`
-- or `config.json` field `device_role`
+- `DP1` -> `15`
+- `DP2` -> `19`
+- `HDMI` -> `17`
 
-Valid values are:
-
-- `tower`
-- `laptop`
-
-Examples:
-
-- Tower role with UI port `DP1` -> on Samsung trigger `15`, send `DDM.exe /MNT:AW3423DWF /WriteActiveInput DP1`
-- Laptop role with UI port `DP2` -> on Samsung trigger `19`, send `DDM.exe /MNT:AW3423DWF /WriteActiveInput DP2`
+- If Samsung trigger input matches this device port code, the app runs `DDM.exe /MNT:AW3423DWF /WriteActiveInput <PORT>`.
+- If it does not match, the app waits.
 
 Retry behavior:
 
@@ -66,22 +58,6 @@ uv run monitorcontrol_main.py
 
 ### Easiest option: Startup folder
 
-You can now set the role in the UI, so this step is optional.
-
-If you prefer a default role before opening the dashboard, set it for that Windows user:
-
-Tower machine:
-
-```powershell
-[System.Environment]::SetEnvironmentVariable("KVM_DEVICE_ROLE", "tower", "User")
-```
-
-Laptop machine:
-
-```powershell
-[System.Environment]::SetEnvironmentVariable("KVM_DEVICE_ROLE", "laptop", "User")
-```
-
 1. Press `Win + R`
 2. Run: