Screenmute Feature

[DPStokesNZ]

Not an issue per se, more of a feature/function update.

There's a "hidden" (i.e.: not documented in the MDC protocol document other than in the changelog) screen mute function available on the devices which quickly blanks/unblanks the screen (rather than powering on/off, standby, etc). The name is a bit of a misnomer but that's the name on the remote button for the Samsung SBox. It works on regular panels too.

diff --git a/samsung_mdc/commands.py b/samsung_mdc/commands.py
index a2be5ff..fe91cfb 100644
--- a/samsung_mdc/commands.py
+++ b/samsung_mdc/commands.py
@@ -1398,3 +1398,15 @@ class VIDEO_WALL_MODEL(Command):
     GET, SET = True, True
 
     DATA = [VideoWallModel('MODEL'), Int('SERIAL', range(1, 256))]
+
+class SCREEN_MUTE(Command):
+
+    CMD = 0xFE
+    SUBCMD = 0x51
+    GET, SET = True, True
+
+    class SCREEN_MUTE_STATUS(IntEnum):
+        ON = 0x00
+        OFF = 0xFF
+
+    DATA = [SCREEN_MUTE_STATUS]