Updated I2C for ESP32 and added mutex protection for printable serial

include/sta/devices/arduino/printable_serial.hpp

@@ -4,15 +4,20 @@
 #include <sta/debug/printing/printable.hpp>
 #ifdef STA_PLATFORM_ARDUINO
 
+#include <sta/mutex.hpp>
+
 namespace sta
 {
     class PrintableSerial: public Printable
     {
     public:
         /**
-         * @brief Construct a new Printable Serial object
+         * @brief Printable implementation for Arduino Serial printing.
+         * 
+         * @param baud The baud rate for serial printing.
+         * @param mutex An optional mutex to protect the serial bus.
          */
-        PrintableSerial(unsigned long baud);
+        PrintableSerial(unsigned long baud, Mutex * mutex = nullptr);
 
         /**
          * @brief Print string.
@@ -21,6 +26,8 @@ namespace sta
          * @param length    String length
          */
         void print(const char * str, size_t length) override;
+    private:
+        Mutex * mutex_;
     };
 } // namespace sta