syntax = "proto3";

package whgw_hr;

option go_package = "hr_receiver/proto;whgw_hrpb";

enum HrConfidence {
  // [0,25)
  ZERO = 0;
  // [25,50)
  LOW = 1;
  // [50,75]
  MEDIUM = 2;
  // (75,100]
  HIGH = 3;
}

enum LoRaBW {
  // nobody is using 7.8 kHz bandwidth
  // so to satisfy protobuf, we use NONE for zero value
  BW_NONE = 0;
  // 10.4 kHz
  BW_10_4 = 0x08;
  // 15.6 kHz
  BW_15_6 = 0x01;
  // 20.8 kHz
  BW_20_8 = 0x09;
  // 31.25 kHz
  BW_31_25 = 0x02;
  // 41.7 kHz
  BW_41_7 = 0x0A;
  // 62.5 kHz
  BW_62_5 = 0x03;
  // 125.0 kHz
  BW_125_0 = 0x04;
  // 250.0 kHz
  BW_250_0 = 0x05;
  // 500.0 kHz
  BW_500_0 = 0x06;
}

message LoRaParameters {
  LoRaBW bw = 1;
  uint32 sf = 2;
  float frequency_mhz = 3;
}

message StatusFlag {
  HrConfidence hr_confidence = 1;
  bool         is_active = 2;
  bool         is_on_skin = 3;
  uint32       battery = 4;
}


message HrPacket {
  StatusFlag status = 1;
  uint32 id = 2;
  uint32 packet_num = 3;
  uint32 hr = 4;
}

message StepCountPacket {
  uint32 id = 1;
  uint32 packet_num = 2;
  uint32 step_count = 3;
}

message RawPacketStatus {
  // Estimation of RSSI of the LoRa signal (after despreading) on last packet received.
  // to get the actual RSSI in dBm, divide by 2 and negate
  uint32 signal_rssi_x2_neg = 1;
  // Estimation of RSSI of the LoRa signal (after despreading) on last packet received.
  // to get the actual SNR in dB, divide by 4
  int32  snr_pkt_x4 = 2;
}

message PacketStatus {
  // Estimation of RSSI of the LoRa signal (after despreading) on last packet received.
  float signal_rssi_neg = 1;
  // Estimation of RSSI of the LoRa signal (after despreading) on last packet received.
  float snr_pkt = 2;
}

message HubInfo {
  uint32         bus_id = 1;
  uint32         sub_dev_id = 2;
  /** optional **/
  LoRaParameters radio_parameters = 3;
}

message RadioData {
  HubInfo         hub_info = 1;
  RawPacketStatus raw_packet_status = 2;
  bytes           data = 3;
}

/**

 NOTIFY (NTF): MISO, unack
 SIGNAL (SIG): MOSI, unack

 INDICATE (INF): MISO, needs MOSI CONFIRM
 CONFIRM (CNF): MOSI, confirms MISO INDICATE

 REQUEST (REQ): MOSI, needs MISO RESPONSE
 RESPONSE (RSP): MISO, responds to MOSI REQUEST

 note that frame type is only about its direction and acknowledge behavior,
 the actual semantics are dependent on the payload

 *
 **/

enum PacketKind {
  NTF = 0;
  SIG = 1;
  INF = 2;
  CNF = 3;
  REQ = 4;
  RSP = 5;
}

enum NetworkUplinkKind {
  NETWORK_UPLINK_UNKNOWN = 0;
  NETWORK_UPLINK_WIFI = 1;
  NETWORK_UPLINK_CELLULAR = 2;
}

message CellularModemInfo {
  string imei = 1;
  int32  rssi = 2;
  int32  ber = 3;
}

message GatewayInfoExtra {
  uint32            schema_version = 1;
  NetworkUplinkKind active_uplink = 2;
  CellularModemInfo cellular_modem = 3;
}

message GatewayStateReportExtra {
  uint32            schema_version = 1;
  NetworkUplinkKind selected_uplink = 2;
  NetworkUplinkKind active_uplink = 3;
  bool              cellular_modem_present = 4;
}

message GatewayStateReport {
  bool   network_has_connection = 1;
  bool   network_has_ip = 2;
  bool   network_has_mqtt_connection = 3;
  bool   bluetooth_has_connect = 4;
  uint32 error_code = 5;
  GatewayStateReportExtra extra = 6;
}

/*** Hub (S) to Gateway (M) ***/
message HubSlaveOutGatewayMasterInMsg {
  oneof choice {
    RadioData   ntf_radio_data = 1;
    BatteryInfo ntf_battery_info = 2;
  }
}

/*** Gateway (M) to Hub (S) ***/
message GatewayMasterOutHubSlaveInMsg {
  oneof choice {
    GatewayStateReport sig_gateway_state_report = 1;
  }
}


/*** Gateway to MQTT ***/
message GatewaySlaveOutCloudMasterInMsg {
  oneof choice {
    HrMeasurement ntf_hr_measurement = 1;
    GatewayStatus ntf_gateway_status = 2;
    StepCountMeasurement ntf_step_count_measurement = 3;
  }
}

/** note that the endpoint should be v2 **/

message BatteryInfo {
  uint32 voltage_mv = 1;
  uint32 soc_percentage = 2;
  sint32 charging_rate_percentage = 3;
}

message GatewayInfo {
  uint32 region_id = 1;
  bytes  gateway_mac = 2;
  GatewayInfoExtra extra = 3;
}

message IPacketStatus {
  oneof choice {
    RawPacketStatus raw = 1;
    PacketStatus    parsed = 2;
  }
}

message HrMeasurement {
  HrPacket      hr_packet = 1;
  IPacketStatus packet_status = 2;
  GatewayInfo   gateway_info = 3;
  HubInfo       hub_info = 4;
}

message StepCountMeasurement {
  StepCountPacket step_count_packet = 1;
  IPacketStatus   packet_status = 2;
  GatewayInfo     gateway_info = 3;
  HubInfo         hub_info = 4;
}

message GatewayStatistic {
  // Number of times the gateway has booted in history
  uint32      boot_count = 1;
  // Uptime of the device (in ms)
  uint32      uptime_ms = 2;
  // Duration (in ms) since last packet received
  // would be the duration since boot if no packets received yet
  uint32      duration_ms_since_last_packet = 3;
  // Total number of packets received since boot
  uint32      rx_count = 4;
  // optional, battery info
  BatteryInfo battery_info = 5;
}

message GatewayStatus {
  GatewayInfo      info = 1;
  GatewayStatistic stat = 2;
}

message Status {
  int32  code = 1;
  string message = 2;
}

/** Gateway Configuration Messages **/
/** Master is Gateway; Slave is config client (bluetooth central, phone etc.) **/

enum GatewayConfigEntryKind {
  REGION_ID = 0;
  WIFI_SSID = 1;
  WIFI_PASSWORD = 2;
  NETWORK_UPLINK = 3;
  CELLULAR_APN = 4;
}

message GatewayConfigEntry {
  oneof choice {
    uint32 region_id = 1;
    string wifi_ssid = 2;
    string wifi_password = 3;
    NetworkUplinkKind network_uplink = 4;
    string cellular_apn = 5;
  }
}

message GatewayConfigMasterOutSlaveInMsg {
  oneof choice {
    GatewayConfigEntry cnf_get_entry = 1;
    Status             cnf_get_failure = 2;
    Status             cnf_set_entry = 3;
  }
}

message GatewayConfigMasterInSlaveOutMsg {
  oneof choice {
    GatewayConfigEntryKind inf_get_entry = 1;
    GatewayConfigEntry inf_set_entry = 2;
  }
}