flatudp: the signal-list codec, with a hand-computed decode check

src/ui.cpp

@@ -6118,6 +6118,9 @@ int run_ui(int argc, char** argv, const Config& cfg, ScopeModel& model, Acquisit
   if (const char* env = g_getenv("UDPSCOPE_PROBE_E1608_RECONNECT")) {
     g_timeout_add(static_cast<guint>(std::atoi(env)), e1608_probe_reconnect, &app);
   }
+  if (const char* env = g_getenv("UDPSCOPE_PROBE_FLATUDP")) {
+    g_timeout_add(static_cast<guint>(std::atoi(env)), flatudp_probe, &app);
+  }
 
   // Our own options were consumed by parse_args(); GTK would reject them, so only
   // the program name is handed to g_application_run().