diff --git a/lib_standalone/emsuart_standalone.cpp b/lib_standalone/emsuart_standalone.cpp
index 4e1b24af1..4e506d835 100644
--- a/lib_standalone/emsuart_standalone.cpp
+++ b/lib_standalone/emsuart_standalone.cpp
@@ -56,7 +56,7 @@ void EMSuart::send_poll(uint8_t data) {
  * buf contains the CRC and len is #bytes including the CRC
  * returns code, 0=success, 1=brk error, 2=watchdog timeout
  */
-EMSUART_STATUS EMSuart::transmit(uint8_t * buf, uint8_t len) {
+uint16_t EMSuart::transmit(uint8_t * buf, uint8_t len) {
     if (len == 0) {
         return EMS_TX_STATUS_OK; // nothing to send
     }
diff --git a/lib_standalone/emsuart_standalone.h b/lib_standalone/emsuart_standalone.h
index 7d6a8fe04..8fa13e8f2 100644
--- a/lib_standalone/emsuart_standalone.h
+++ b/lib_standalone/emsuart_standalone.h
@@ -23,25 +23,22 @@
 
 namespace emsesp {
 
-typedef enum {
-    EMS_TX_STATUS_OK = 1,
-    EMS_TX_WTD_TIMEOUT, // watchdog timeout during send
-    EMS_TX_BRK_DETECT,  // incoming BRK during Tx
-} EMSUART_STATUS;
+#define EMS_TX_STATUS_ERR 0
+#define EMS_TX_STATUS_OK 1
 
 class EMSuart {
   public:
     EMSuart()  = default;
     ~EMSuart() = default;
 
-    static void           start(uint8_t tx_mode);
-    static void           stop();
-    static void           restart();
-    static void           send_poll(uint8_t data);
-    static EMSUART_STATUS transmit(uint8_t * buf, uint8_t len);
+    static void     start(uint8_t tx_mode);
+    static void     stop();
+    static void     restart();
+    static void     send_poll(uint8_t data);
+    static uint16_t transmit(uint8_t * buf, uint8_t len);
 
   private:
-    static char *  hextoa(char * result, const uint8_t value);
+    static char * hextoa(char * result, const uint8_t value);
 };
 
 } // namespace emsesp