#51 init mac component from config key

supervisor/config.lua

@@ -17,6 +17,11 @@ config.PLC_TIMEOUT = 5
 config.RTU_TIMEOUT = 5
 config.CRD_TIMEOUT = 5
 config.PKT_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"
 
 -- expected number of reactors
 config.NUM_REACTORS = 4

supervisor/startup.lua

@@ -95,6 +95,12 @@ 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
         println("startup> wireless modem not found")