Moved power fsm thread out of main (#1265)

src/PowerFSMThread.h

@@ -0,0 +1,38 @@
+#include "configuration.h"
+#include "concurrency/OSThread.h"
+#include "main.h"
+#include "PowerFSM.h"
+#include "power.h"
+#include "NodeDB.h"
+
+namespace concurrency
+{
+/// Wrapper to convert our powerFSM stuff into a 'thread'
+class PowerFSMThread : public OSThread
+{
+  public:
+    // callback returns the period for the next callback invocation (or 0 if we should no longer be called)
+    PowerFSMThread() : OSThread("PowerFSM") {}
+
+  protected:
+    int32_t runOnce() override
+    {
+        powerFSM.run_machine();
+
+        /// If we are in power state we force the CPU to wake every 10ms to check for serial characters (we don't yet wake
+        /// cpu for serial rx - FIXME)
+        auto state = powerFSM.getState();
+        canSleep = (state != &statePOWER) && (state != &stateSERIAL);
+
+        if (powerStatus->getHasUSB()) {
+            timeLastPowered = millis();
+        } else if (radioConfig.preferences.on_battery_shutdown_after_secs > 0 && 
+                    millis() > timeLastPowered + (1000 * radioConfig.preferences.on_battery_shutdown_after_secs)) { //shutdown after 30 minutes unpowered
+            powerFSM.trigger(EVENT_SHUTDOWN);
+        }
+        
+        return 10;
+    }
+};
+
+}