syntax = "proto3"
message Data {
    // Unix timestamp - UTC - granularity milliseconds
    optional int64 utc_timestamp = 1;
    // Both latitude and longitude in decimal degrees
    optional double latitude = 2;
    optional double longitude = 3;
    // Elevation from mean sea level in meters (m)
    optional int32 elevation = 4;
    // Heart rate in beats per minute (BPM)
    optional uint32 heart_rate = 5;
    // Speed in kilometers per hour (km/h)
    optional uint32 speed = 6;
    // Cadence in revolutions per minute (RPM)
    optional uint32 cadence = 7;
    // Temperature in celsius (°C)
    optional uint32 temperature = 8;
    // Power in watts (W)
    optional uint32 power = 9;
    // Inaccurate power estimate in watts (W)
    optional uint32 power_estimate = 10;
    // Respiration rate in breaths per minute (brpm)
    optional uint32 respiration_rate = 11;
}