message_protocol.h

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#ifndef PROTOCOL_H
#define PROTOCOL_H
 
#include <stdint.h>
 
typedef uint8_t esp_message_id_t;
 
#define MSG_REGISTRATION 0
#define MSG_MEASUREMENT  1
#define MSG_ALARM        2
#define WIFI_CHANNEL     1
#define MAX_RETRY        3
#define TIMEOUT_MS       200 // tweak
 
typedef struct
{
    uint8_t id;
} msg_header_t;
 
// Registration message sent by slave → broadcast
typedef struct
{
    msg_header_t header;
    char name[32];
    int32_t longitude; // [-180; 180]  * 1e6
    int32_t latitude;  // [-90; 90]    * 1e6
} registration_msg_t;
 
// Acknowledgement for registration sent master → slave
typedef struct
{
    msg_header_t header;
} ack_registration_t;
 
// Measurement message sent by slave → master
typedef struct
{
    msg_header_t header;
    uint8_t moisture;
    uint8_t battery;
} measurement_msg_t;
 
// Measurement ACK with time sync sent master → slave
typedef struct
{
    msg_header_t header;
    uint64_t masterTime;
} ack_measurement_t;
 
// Alarm message sent by slave → master
typedef struct
{
    msg_header_t header;
} alarm_msg_t;
 
// Alarm acknowledgment sent master → slave
typedef struct
{
    msg_header_t header;
} ack_alarm_t;
 
typedef union {
    msg_header_t header;
    registration_msg_t registration;
    measurement_msg_t measurement;
    alarm_msg_t alarm;
 
    ack_registration_t ack_reg;
    ack_measurement_t ack_meas;
    ack_alarm_t ack_alarm;
} message_data_t;
 
// internal struct to process messages
typedef struct
{
    message_data_t data;
    uint8_t mac[6];
 
} message_packet_t;
 
#endif // PROTOCOL_H