Add arduino-timer library

platformio.ini

@@ -24,4 +24,6 @@ lib_deps =
 
     plapointe6/EspMQTTClient@^1.13.3
 
+    contrem/arduino-timer@^3.0.1
+
     RFPowerView=https://git.mattway.com.au/matt/RFPowerView.git

src/main.cpp

@@ -1,5 +1,6 @@
 #include <Arduino.h>
 #include <EspMQTTClient.h>
+#include <arduino-timer.h>
 #include <RFPowerView.h>
 #include "secrets.h"
 
@@ -24,6 +25,8 @@ EspMQTTClient client(
   1883
 );
 
+auto timer = Timer<10, millis, uint16_t>();
+
 void processPacket(const Packet*);
 
 bool sendOpenPacket(uint16_t destination);