#51 init mac component from config key

pocket/config.lua

@@ -10,6 +10,11 @@ config.PKT_CHANNEL = 16244
 config.TRUSTED_RANGE = 0
 -- time in seconds (>= 2) before assuming a remote device is no longer active
 config.COMMS_TIMEOUT = 5
+-- facility authentication key (do NOT use one of your passwords)
+-- this enables verifying that messages are authentic
+-- all devices on the same network must use the same key
+-- message authentication codes require computing a hash on each message, so this can slow things down
+-- config.AUTH_KEY = "SCADAfacility123"
 
 -- log path
 config.LOG_PATH = "/log.txt"