param_server: add setting for extended

protos/param_server/param_server.proto

@@ -9,6 +9,14 @@ option java_outer_classname = "ParamServerProto";
 
 // Provide raw access to retrieve and provide server parameters.
 service ParamServerService {
+    /*
+     * Set param protocol.
+     *
+     * The extended param protocol is used by default. This allows to use the previous/normal one.
+     *
+     * Note that camera definition files are meant to implement/use the extended protocol.
+     */
+    rpc SetProtocol(SetProtocolRequest) returns(SetProtocolResponse) { option (mavsdk.options.async_type) = SYNC; }
     /*
      * Retrieve an int parameter.
      *
@@ -60,6 +68,13 @@ service ParamServerService {
     rpc SubscribeChangedParamCustom(SubscribeChangedParamCustomRequest) returns(stream ChangedParamCustomResponse) { option (mavsdk.options.async_type) = ASYNC; }
 }
 
+message SetProtocolRequest {
+    bool extended_protocol = 1; // Use extended protocol
+}
+message SetProtocolResponse {
+    ParamServerResult param_server_result = 1;
+}
+
 message RetrieveParamIntRequest {
     string name = 1; // Name of the parameter
 }