#define ESP32_MTU                   1500

#define ESP32_MAX_MTYPE             16

#define ESP32_MTYPE_SLEEP           0x20    /* does not have net handler */

#define ESP32_MTYPE_FLAG_ONEW       0x80
#define ESP32_MTYPE_FLAG_REPL       0x40
#define ESP32_MTYPE_FLAG_BRIDGE     0x08

#define ESP32_MTYPE_MASK            0x0F

int esp32_send(unsigned char *buffer, int block);
int esp32_receive(unsigned char msg_type, int block, unsigned char **buffer);
unsigned char *esp32_alloc(void);
void esp32_free(unsigned char *buffer);