bugfix and increment on touch

monitorReceiver.lua

@@ -52,7 +52,7 @@ function wait_for_components()
     system.timeout = false
     system.components = {}
     system.channels = {}
-    system.index = {}
+    system.index = 0
 
     -- open initializer channel
     system.modem.open(1)
@@ -139,6 +139,9 @@ function get_messages(buffer)
         elseif event == 'timer' then
             system.timeout = true
             return
+        elseif event == 'monitor_touch' then
+            system.index = (system.index + 1) % #system.components
+            return
         end
     end