Add log_streaming (#339)

* Add log_streaming

protos/log_streaming/log_streaming.proto

@@ -0,0 +1,56 @@
+syntax = "proto3";
+
+package mavsdk.rpc.log_streaming;
+
+import "mavsdk_options.proto";
+
+option java_package = "io.mavsdk.log_streaming";
+option java_outer_classname = "LogStreamingProto";
+
+// Provide log streaming data.
+service LogStreamingService {
+ // Start streaming logging data.
+ rpc StartLogStreaming(StartLogStreamingRequest) returns(StartLogStreamingResponse) {}
+ // Stop streaming logging data.
+ rpc StopLogStreaming(StopLogStreamingRequest) returns(StopLogStreamingResponse) {}
+ // Subscribe to logging messages
+ rpc SubscribeLogStreamingRaw(SubscribeLogStreamingRawRequest) returns(stream LogStreamingRawResponse) { option (mavsdk.options.async_type) = ASYNC; }
+}
+
+message StartLogStreamingRequest {}
+message StartLogStreamingResponse {
+ LogStreamingResult log_streaming_result = 1;
+}
+
+message StopLogStreamingRequest {}
+message StopLogStreamingResponse {
+ LogStreamingResult log_streaming_result = 1;
+}
+
+message SubscribeLogStreamingRawRequest {}
+message LogStreamingRawResponse {
+ LogStreamingRaw logging_raw = 1; // A message containing logged data
+}
+
+// Raw logging data type
+message LogStreamingRaw {
+ string data = 1; // Ulog file stream data encoded as base64
+}
+
+// Result type.
+message LogStreamingResult {
+ // Possible results returned for logging requests
+ enum Result {
+ RESULT_SUCCESS = 0; // Request succeeded
+ RESULT_NO_SYSTEM = 1; // No system connected
+ RESULT_CONNECTION_ERROR = 2; // Connection error
+ RESULT_BUSY = 3; // System busy
+ RESULT_COMMAND_DENIED = 4; // Command denied
+ RESULT_TIMEOUT = 5; // Timeout
+ RESULT_UNSUPPORTED = 6; // Unsupported
+ RESULT_UNKNOWN = 7; // Unknown error
+ }
+
+ Result result = 1; // Result enum value
+ string result_str = 2; // Human-readable English string describing the result
+}