datastream is only for 10g for eiger atm, its mentioned in comments. accordingly handled in receiver. This is better solution, in case it was disabled in 10g, and not possible to set enable in 1g mode, which is given to the receiver

slsDetectorServers/eigerDetectorServer/slsDetectorFunctionList.c

@@ -2105,6 +2105,9 @@ int setDataStream(enum portPosition port, int enable) {
         LOG(logERROR, ("Invalid setDataStream enable argument: %d\n", enable));
         return FAIL;
     }
+    LOG(logINFO,
+        ("%s 10GbE %s datastream\n", (enable ? "Enabling" : "Disabling"),
+         (port == LEFT ? "left" : "right")));
 #ifdef VIRTUAL
     if (port == LEFT) {
         eiger_virtual_left_datastream = enable;