proto/ft: fix idempotent dataid for freetrackclient

It can cause problems for `freetrackclient.dll'
consumers. This fix is better than modulo rand().

2 files changed, 5 insertions, 1 deletions

diff --git a/proto-ft/ftnoir_protocol_ft.cpp b/proto-ft/ftnoir_protocol_ft.cpp
index d240cc8d..0c97ffd2 100644
--- a/proto-ft/ftnoir_protocol_ft.cpp
+++ b/proto-ft/ftnoir_protocol_ft.cpp
@@ -97,7 +97,10 @@ void freetrack::pose(const double* headpose)
 
     const std::int32_t id = load(ft->GameID);
 
-    store(data->DataID, 60 * 5);
+    data_id++;
+    data_id %= 128;
+
+    store(data->DataID, 60 * 5 + data_id);
 
     if (intGameID != id)
     {
diff --git a/proto-ft/ftnoir_protocol_ft.h b/proto-ft/ftnoir_protocol_ft.h
index ac82bbd9..843d1f34 100644
--- a/proto-ft/ftnoir_protocol_ft.h
+++ b/proto-ft/ftnoir_protocol_ft.h
@@ -54,6 +54,7 @@ private:
     int intGameID = -1;
     QString connected_game;
     QMutex game_name_mutex;
+    unsigned data_id = 0;
 
     void start_dummy();
     static float degrees_to_rads(double degrees);