this include might be missing

src/fsfw_hal/linux/serial/helper.cpp

@@ -1,5 +1,7 @@
 #include <fsfw_hal/linux/serial/helper.h>
 #include <sys/ioctl.h>
+#include "FSFWConfig.h"
+#include "fsfw/serviceinterface.h"
 
 void serial::setMode(struct termios& options, UartModes mode) {
   if (mode == UartModes::NON_CANONICAL) {
@@ -151,16 +153,15 @@ int serial::readCountersAndErrors(int serialPort, serial_icounter_struct& icount
 }
 
 void serial::setStopbits(struct termios& options, StopBits bits) {
-  // Regular case: One stop bit.
-  options.c_cflag &= ~CSTOPB;
   if (bits == StopBits::TWO_STOP_BITS) {
     // Use two stop bits
     options.c_cflag |= CSTOPB;
+  } else {
+    // Clear stop field, only one stop bit used in communication
+    options.c_cflag &= ~CSTOPB;
   }
 }
 
 void serial::flushRxBuf(int fd) { tcflush(fd, TCIFLUSH); }
 
 void serial::flushTxRxBuf(int fd) { tcflush(fd, TCIOFLUSH); }
-
-void serial::flushTxBuf(int fd) { tcflush(fd, TCOFLUSH); }

src/fsfw_hal/linux/serial/helper.h

@@ -65,7 +65,6 @@ void setParity(struct termios& options, Parity parity);
 void ignoreCtrlLines(struct termios& options);
 
 void flushRxBuf(int fd);
-void flushTxBuf(int fd);
 void flushTxRxBuf(int fd);
 
 int readCountersAndErrors(int serialPort, serial_icounter_struct& icounter);