Add mechanism to disable temporary compiler warnings in a sequence of code.

m-serial-json.h

@@ -28,6 +28,8 @@
 #include "m-core.h"
 #include "m-string.h"
 
+M_BEGIN_PROTECTED_CODE
+
 /* Write the boolean 'data' into the serial stream 'serial'.
    Return M_SERIAL_OK_DONE if it succeeds, M_SERIAL_FAIL otherwise */
 static inline m_serial_return_code_t
@@ -562,4 +564,6 @@ typedef m_serial_read_t m_serial_json_read_t;
 #define M_OPL_m_serial_json_read_t()                                    \
   (INIT_WITH(m_serial_json_read_init), CLEAR(m_serial_json_read_clear), TYPE(m_serial_json_read_t) )
 
+M_END_PROTECTED_CODE
+
 #endif