slow rate updates

src/asynStreamGeneratorDriver.cpp

@@ -347,7 +347,6 @@ asynStatus asynStreamGeneratorDriver::writeInt32(asynUser *pasynUser,
 void asynStreamGeneratorDriver::receiveUDP() {
 
     // TODO fix time overflows
-    // TODO check for lost packets
 
     const char *functionName = "receiveUDP";
     asynStatus status = asynSuccess;
@@ -630,12 +629,14 @@ void asynStreamGeneratorDriver::processEvents() {
 
             countDiffsPtr = (countDiffsPtr + 1) % 10;
 
-            lock();
-            for (size_t i = 0; i < num_channels; ++i) {
-                setIntegerParam(P_Rates[i], rates[i]);
+            if (countDiffsPtr % 5 == 0) {
+                lock();
+                for (size_t i = 0; i < num_channels; ++i) {
+                    setIntegerParam(P_Rates[i], rates[i]);
+                }
+                callParamCallbacks();
+                unlock();
             }
-            callParamCallbacks();
-            unlock();
         }
     }
 }