modify rx windows time error

Author: Heltec-Aaron-Lee

cores/asr6601/base/Arduino.h

@@ -75,6 +75,7 @@
 uint16_t makeWord(uint16_t w);
 uint16_t makeWord(byte h, byte l);
 
+#define nullptr NULL
 #define word(...) makeWord(__VA_ARGS__)
 
 uint32_t pulseIn(uint8_t pin_name,uint8_t mode,uint32_t timeout = 1000000);

libraries/LoraWan102/src/loramac/LoRaMac.c

@@ -3157,7 +3157,7 @@ LoRaMacStatus_t LoRaMacInitialization( LoRaMacPrimitives_t *primitives, LoRaMacC
     // Init parameters which are not set in function ResetMacParameters
     LoRaMacParams.RepeaterSupport = false;
     LoRaMacParamsDefaults.ChannelsNbRep = 1;
-    LoRaMacParamsDefaults.SystemMaxRxError = 10;
+    LoRaMacParamsDefaults.SystemMaxRxError = 20;
     LoRaMacParamsDefaults.MinRxSymbols = 6;
 
     LoRaMacParams.SystemMaxRxError = LoRaMacParamsDefaults.SystemMaxRxError;