增加休眠，开始上板测试

jinlicong

2024-05-29 6c7e61a54ef9b96f79704f0b965664e89f57dd52

 Function/modbus/rtu/mbrtu.c

@@ -223,7 +223,7 @@
               pucSndBufferCur++;  /* next byte in sendbuffer. */
               usSndBufferCount--;
         }
         memset(ucRTUBuf,0,sizeof(ucRTUBuf));
         memset((uint8_t *)ucRTUBuf,0,sizeof(ucRTUBuf));
         
         xMBPortEventPost( EV_READY );
         /* Disable transmitter. This prevents another transmit buffer