initial backend command stuff

server/proto/core.proto

@@ -48,3 +48,22 @@ service TelemetryService {
     rpc NewTelemetry (TelemetryDefinitionRequest) returns (TelemetryDefinitionResponse);
     rpc InsertTelemetry (stream TelemetryItem) returns (stream TelemetryInsertResponse);
 }
+
+message CommandParameterDefinition {
+    string name = 1;
+    TelemetryDataType data_type = 2;
+}
+
+message CommandDefinitionRequest {
+    string name = 1;
+    repeated CommandParameterDefinition parameters = 2;
+}
+
+message Command {
+    Timestamp timestamp = 1;
+    map<string, TelemetryValue> parameters = 2;
+}
+
+service CommandService {
+    rpc NewCommand (CommandDefinitionRequest) returns (stream Command);
+}