diff --git a/examples/modbusmaster/mbmaster_main.c b/examples/modbusmaster/mbmaster_main.c
index 70e0aa239..4f80f1267 100644
--- a/examples/modbusmaster/mbmaster_main.c
+++ b/examples/modbusmaster/mbmaster_main.c
@@ -280,7 +280,7 @@ int main(int argc, FAR char *argv[])
 
   if (ret != OK)
     {
-      fprintf(stderr, "mbmaster_main: ",
+      fprintf(stderr, "mbmaster_main: "
               "ERROR: mbmaster_initialize failed: %d\n", ret);
       goto errout;
     }
@@ -292,11 +292,15 @@ int main(int argc, FAR char *argv[])
 
   if (ret != OK)
     {
-      fprintf(stderr, "mbmaster_main: ",
+      fprintf(stderr, "mbmaster_main: "
               "ERROR: mbmaster_pollthread create failed: %d\n", ret);
       goto errout_with_initialize;
     }
 
+  /* Work around to give time to pthread_create run the modbus poller */
+
+  usleep(100000);
+
   printf("Sending %d requests to slave %d\n",
          MBMASTER_REQUESTS_COUNT, SLAVE_ID);
 
diff --git a/include/modbus/mbport.h b/include/modbus/mbport.h
index ab4a374f9..eabf23072 100644
--- a/include/modbus/mbport.h
+++ b/include/modbus/mbport.h
@@ -126,7 +126,7 @@ bool xMBPortEventGet(eMBEventType *eEvent);
 
 bool xMBMasterPortEventInit(void);
 bool xMBMasterPortEventPost(eMBMasterEventType eEvent);
-bool xMBMasterPortEventGet(eMBMasterEventType * eEvent);
+bool xMBMasterPortEventGet(eMBMasterEventType *eEvent);
 void vMBMasterOsResInit(void);
 bool xMBMasterRunResTake(int32_t time);
 void vMBMasterRunResRelease(void);
@@ -138,7 +138,7 @@ bool xMBPortSerialInit(uint8_t ucPort, speed_t ulBaudRate,
 void vMBPortClose(void);
 void xMBPortSerialClose(void);
 void vMBPortSerialEnable(bool xRxEnable, bool xTxEnable);
-bool xMBPortSerialGetByte(int8_t * pucByte);
+bool xMBPortSerialGetByte(int8_t *pucByte);
 bool xMBPortSerialPutByte(int8_t ucByte);
 
 bool xMBMasterPortSerialInit(uint8_t ucPort, speed_t ulBaudRate,
@@ -146,7 +146,7 @@ bool xMBMasterPortSerialInit(uint8_t ucPort, speed_t ulBaudRate,
 void vMBMasterPortClose(void);
 void xMBMasterPortSerialClose(void);
 void vMBMasterPortSerialEnable(bool xRxEnable, bool xTxEnable);
-bool xMBMasterPortSerialGetByte(int8_t * pucByte);
+bool xMBMasterPortSerialGetByte(int8_t *pucByte);
 bool xMBMasterPortSerialPutByte(int8_t ucByte);
 
 /* Timers functions */
diff --git a/modbus/mb_m.c b/modbus/mb_m.c
index 336181136..16323d770 100644
--- a/modbus/mb_m.c
+++ b/modbus/mb_m.c
@@ -429,6 +429,13 @@ eMBErrorCode eMBMasterPoll(void)
 
           vMBMasterRunResRelease();
           break;
+
+          case EV_MASTER_PROCESS_SUCCESS:
+          case EV_MASTER_ERROR_RESPOND_TIMEOUT:
+          case EV_MASTER_ERROR_RECEIVE_DATA:
+          case EV_MASTER_ERROR_EXECUTE_FUNCTION:
+          default:
+          break;
         }
     }
 
diff --git a/modbus/nuttx/portevent_m.c b/modbus/nuttx/portevent_m.c
index cc7dd824e..e201ab284 100644
--- a/modbus/nuttx/portevent_m.c
+++ b/modbus/nuttx/portevent_m.c
@@ -94,7 +94,7 @@ bool xMBMasterPortEventPost(eMBMasterEventType eEvent)
   return true;
 }
 
-bool xMBMasterPortEventGet(eMBMasterEventType * eEvent)
+bool xMBMasterPortEventGet(eMBMasterEventType *eEvent)
 {
   bool xEventHappened = false;
 
@@ -227,7 +227,7 @@ void vMBMasterRunResRelease(void)
  */
 
 void vMBMasterErrorCBRespondTimeout(uint8_t ucDestAddress,
-                                    const uint8_t * pucPDUData,
+                                    const uint8_t *pucPDUData,
                                     uint16_t usPDULength)
 {
   xMBMasterPortEventPost(EV_MASTER_ERROR_RESPOND_TIMEOUT);
@@ -243,7 +243,7 @@ void vMBMasterErrorCBRespondTimeout(uint8_t ucDestAddress,
  */
 
 void vMBMasterErrorCBReceiveData(uint8_t ucDestAddress,
-                                 const uint8_t * pudPDUData,
+                                 const uint8_t *pudPDUData,
                                  uint16_t usPDULength)
 {
   xMBMasterPortEventPost(EV_MASTER_ERROR_RECEIVE_DATA);
@@ -259,7 +259,7 @@ void vMBMasterErrorCBReceiveData(uint8_t ucDestAddress,
  */
 
 void vMBMasterErrorCBExecuteFunction(uint8_t ucDestAddress,
-                                     const uint8_t * pucPDUData,
+                                     const uint8_t *pucPDUData,
                                      uint16_t usPDULength)
 {
   xMBMasterPortEventPost(EV_MASTER_ERROR_EXECUTE_FUNCTION);
diff --git a/modbus/rtu/mbrtu_m.c b/modbus/rtu/mbrtu_m.c
index d835b5a7f..3fde50670 100644
--- a/modbus/rtu/mbrtu_m.c
+++ b/modbus/rtu/mbrtu_m.c
@@ -278,7 +278,7 @@ bool xMBMasterRTUReceiveFSM(void)
 
   /* Always read the character. */
 
-  xMBMasterPortSerialGetByte((uint8_t *) & ucByte);
+  xMBMasterPortSerialGetByte((int8_t *) & ucByte);
 
   switch (eRcvState)
     {
@@ -397,6 +397,10 @@ bool xMBMasterRTUTransmitFSM(void)
             }
         }
       break;
+
+      case STATE_M_TX_XFWR:
+      default:
+      break;
     }
 
   return xNeedPoll;