fix data get

services/spectrometer/spectrometer/engine.py

@@ -568,7 +568,7 @@ class DefaultEngine:
                 return ret
 
             ret = self.sdrUp(None)
-            if(ret[0] != 0):
+            if ret != 0:   # sdrUp returns 0 (int) on success, tuple on error
                 return ret