First proto definition.

data.proto

@@ -0,0 +1,24 @@
+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;
+}