✨ feat(serial): Implement readByte function

Author: NestorDP

include/libserial/serial.hpp

@@ -122,14 +122,13 @@ size_t read(std::shared_ptr<std::string> buffer, size_t max_length);
 /**
  * @brief Read a single byte from the serial port
  *
- * Reads one byte from the serial port and stores it in the provided buffer.
+ * Reads one byte from the serial port.
  *
- * @param buffer Shared pointer to string where the byte will be stored
- * @return Number of bytes actually read (1 if successful, 0 on error)
+ * @return The byte read from the serial port
  * @throws SerialException if read operation fails
  * @throws SerialException if buffer is null
  */
-void readByte([[maybe_unused]] std::shared_ptr<std::string> buffer);
+char readByte();
 
 /**
  * @brief Reads data until a specific terminator character is found

src/serial.cpp

@@ -69,8 +69,13 @@ size_t Serial::read(std::shared_ptr<std::string> buffer, size_t max_length) {
   return static_cast<size_t>(bytes_read);
 }
 
-void Serial::readByte([[maybe_unused]] std::shared_ptr<std::string> buffer) {
-  // Implementation can be added here if needed
+char Serial::readByte() {
+  char byte = 0;
+  ssize_t bytes_read = ::read(fd_serial_port_, &byte, 1);
+  if (bytes_read < 0) {
+    throw SerialException("Error reading from serial port: " + std::string(strerror(errno)));
+  }
+  return byte;
 }
 
 size_t Serial::readUntil(std::shared_ptr<std::string> buffer, char terminator) {