// See `Generator Options` section in
// https://jpa.kapsi.fi/nanopb/docs/reference.html#generator-options
// for nanopb specific options
//
// Remember to include
// https://github.com/nanopb/nanopb/blob/master/generator/proto/nanopb.proto
// when generating the proto file

syntax = "proto3";
import "nanopb.proto";

package hr_packet;

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

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

message LoRaParameters {
    LoRaBW bw = 1;
    int32 sf = 2  [(nanopb).int_size = IS_8];
    float frequency = 3;
}

message StatusFlag {
    HrConfidence hr_confidence = 1 [(nanopb).int_size = IS_8]; 
    bool is_active             = 2;
    bool is_on_skin            = 3;
    uint32 battery             = 4 [(nanopb).int_size = IS_8];
}

message HrOnlyPacket {
    StatusFlag status           = 1 [(nanopb).int_size = IS_8];
    uint32 id                   = 2 [(nanopb).int_size = IS_8];
    uint32 packet_num           = 3 [(nanopb).int_size = IS_8];
    uint32 hr                   = 4 [(nanopb).int_size = IS_8];
}

message HrPpgPacket {
    StatusFlag status           = 1 [(nanopb).int_size = IS_8];
    uint32 id                   = 2 [(nanopb).int_size = IS_8];
    uint32 packet_num           = 3 [(nanopb).int_size = IS_8];
    uint32 hr                   = 4 [(nanopb).int_size = IS_8];
    repeated uint32 ppg_data     = 5 [(nanopb).max_count = 36];
}

message PacketStatus {
	// Estimation of RSSI of the LoRa® signal (after despreading) on last packet received.
    sint32 signal_rssi_pkt      = 1;
}

message GatewayInfo {
    uint32 region_id            = 1 [(nanopb).int_size = IS_8];
    bytes gateway_mac          = 2 [(nanopb).max_size = 6];
    LoRaParameters radio_parameters = 3;
}

message HrPacket {
    GatewayInfo gateway_info     = 1;
    oneof packet {
        HrOnlyPacket hr_only_packet = 2;
        HrPpgPacket hr_ppg_packet = 3;
    }
    PacketStatus packet_status    = 4;
}