syntax = "proto3";

import "nanopb.proto";

package alox;

enum EspNowMessageType {
  ESPNOW_UNKNOWN = 0;
  ESPNOW_DISCOVER = 1;
  ESPNOW_SLAVE_INFO = 2;
  ESPNOW_HEARTBEAT = 3;
  ESPNOW_SET_ACCEL_DEADZONE = 4;
  ESPNOW_UNICAST_TEST = 5;
  ESPNOW_OTA_START = 6;
  ESPNOW_OTA_PAYLOAD = 7;
  ESPNOW_OTA_END = 8;
  ESPNOW_OTA_STATUS = 9;
  ESPNOW_FIND_ME = 10;
}

message EspNowUnicastTest {
  uint32 seq = 1;
}

/** Master → slave: locate pod (LED ring R/G/B ×3 @ full brightness). */
message EspNowFindMe {
  /** 0 = any slave; otherwise only slave_id must match */
  uint32 client_id = 1;
}

message EspNowDiscover {
  uint32 network = 1;
}

message EspNowSlavePresence {
  uint32 network = 1;
  bytes mac = 2;
  uint32 version = 3;
  uint32 slave_id = 4;
  bool available = 5;
  bool used = 6;
}

message EspNowAccelDeadzone {
  uint32 deadzone = 1;
  uint32 client_id = 2; // 0 = all slaves; otherwise only matching slave_id applies
}

// Master → slave: begin OTA (erase inactive slot; slave replies ESPNOW_OTA_STATUS).
message EspNowOtaStart {
  uint32 total_size = 1;
}

// Master → slave: firmware chunk (up to 200 bytes); slave buffers 4 KiB before flash write.
message EspNowOtaPayload {
  uint32 seq = 1;
  bytes data = 2 [(nanopb).max_size = 200];
}

// Master → slave: finalize OTA (flush, esp_ota_end, set boot partition).
message EspNowOtaEnd {}

// Slave → master: status / block ACK (same status codes as UART OtaStatusPayload).
message EspNowOtaStatus {
  uint32 status = 1;
  uint32 bytes_written = 2;
  uint32 error = 3;
}

message EspNowMessage {
  EspNowMessageType type = 1;
  oneof payload {
    EspNowDiscover discover = 2;
    EspNowSlavePresence slave_info = 3;
    EspNowSlavePresence heartbeat = 4;
    EspNowAccelDeadzone accel_deadzone = 5;
    EspNowUnicastTest unicast_test = 6;
    EspNowOtaStart ota_start = 7;
    EspNowOtaPayload ota_payload = 8;
    EspNowOtaEnd ota_end = 9;
    EspNowOtaStatus ota_status = 10;
    EspNowFindMe find_me = 11;
  }
}