#51 init mac component from config key

rtu/config.lua

@@ -10,6 +10,11 @@ config.RTU_CHANNEL = 16242
 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= 2) before assuming a remote device is no longer active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"

rtu/startup.lua

@@ -82,6 +82,11 @@ local function main()
     -- mount connected devices
     ppm.mount_all()
 
+    -- message authentication init
+    if type(config.AUTH_KEY) == "string" then
+        network.init_mac(config.AUTH_KEY)
+    end
+
     -- get modem
     local modem = ppm.get_wireless_modem()
     if modem == nil then