Don't send NodeInfo and DeviceTelemetry at high Tx air util

Also move airtime checking to airtime class

src/airtime.h

@@ -4,6 +4,7 @@
 #include "configuration.h"
 #include <Arduino.h>
 #include <functional>
+#include "MeshRadio.h"
 
 /*
   TX_LOG      - Time on air this device has transmitted
@@ -59,12 +60,17 @@ class AirTime : private concurrency::OSThread
     uint32_t getSecondsSinceBoot();
     uint32_t *airtimeReport(reportTypes reportType);
     uint8_t getSilentMinutes(float txPercent, float dutyCycle);
+    bool isTxAllowedChannelUtil(bool polite=false);
+    bool isTxAllowedAirUtil();
 
   private:
     bool firstTime = true;
     uint8_t lastUtilPeriod = 0;
     uint8_t lastUtilPeriodTX = 0;
     uint32_t secSinceBoot = 0;
+    uint8_t max_channel_util_percent = 40;
+    uint8_t polite_channel_util_percent = 25;
+    uint8_t polite_tx_util_percent = 5;
 
     struct airtimeStruct {
         uint32_t periodTX[PERIODS_TO_LOG];     // AirTime transmitted