-extern bool send_meta_sptps(void *, uint8_t, const char *, size_t);
-extern bool receive_meta_sptps(void *, uint8_t, const char *, uint16_t);
+extern bool send_meta_sptps(void *, uint8_t, const void *, size_t);
+extern bool receive_meta_sptps(void *, uint8_t, const void *, uint16_t);