diff --git a/slsReceiverSoftware/src/FrameSynchronizerApp.cpp b/slsReceiverSoftware/src/FrameSynchronizerApp.cpp
index 4af7e59897..7b28f9140f 100644
--- a/slsReceiverSoftware/src/FrameSynchronizerApp.cpp
+++ b/slsReceiverSoftware/src/FrameSynchronizerApp.cpp
@@ -15,6 +15,7 @@
 #include <iostream>
 #include <ostream>
 #include <semaphore.h>
+#include <sys/socket.h>
 #include <sys/wait.h> //wait
 #include <thread>
 #include <mutex>
@@ -66,6 +67,7 @@ void zmq_free (void *data, void *hint)
 
 
 struct Status{ 
+  bool starting = true;
   bool terminate = false;
   unsigned long num_receivers;
 
@@ -75,6 +77,7 @@ struct Status{
   
   std::vector<zmq_msg_t*> headers;
   std::map<unsigned int, std::map<long unsigned int, std::vector<zmq_msg_t*> > > frames;
+  std::vector<zmq_msg_t*> ends;
   
 };
 
@@ -161,20 +164,46 @@ std::set<long unsigned int> find_keys(const std::map<unsigned int, std::map<long
     return valid_keys;
 }
 
+int zmq_send_multipart(void* socket, const std::vector<zmq_msg_t*>& messages) {
+    size_t num_messages = messages.size();
+
+    // Iterate over each message in the vector
+    for (size_t i = 0; i < num_messages; ++i) {
+        zmq_msg_t* msg = messages[i];
+
+        // Determine flags: ZMQ_SNDMORE for all messages except the last
+        int flags = (i == num_messages - 1) ? 0 : ZMQ_SNDMORE;
+
+        // Send the message part
+        if (zmq_msg_send(msg, socket, flags) == -1) {
+            std::cerr << "Error sending message: " << zmq_strerror(zmq_errno()) << std::endl;
+            return -1;  // Return -1 on error
+        }
+    }
+
+    return 0;  // Return 0 on success
+}
+
 void Correlate(Status *stat) {
-    bool starting = true;
-    std::vector<unsigned int> ports;
+    void *context = zmq_ctx_new ();
+
+    void *socket = zmq_socket (context, ZMQ_PUSH);
+    int rc = zmq_bind (socket, "tcp://*:5555");
+    if (rc != 0){
+      std::cout << "failed to bind";
+    }
+
     while (!stat->terminate) {
-        sem_wait(&(stat->available));
         std::cout << "Correlate cache" << std::endl;
+        sem_wait(&(stat->available));
         {
             std::lock_guard<std::mutex> lock(stat->mtx);
-            if (starting) {
+            if (stat->starting) {
                 if (stat->headers.size() == stat->num_receivers) {
                     std::cout << "got all start messages" << std::endl;
-                    starting = false;
-                    ports.clear();
-
+                    stat->starting = false;
+                    zmq_send_multipart(socket, stat->headers);
+                    stat->headers.clear();
                 }
             }
             else {
@@ -182,12 +211,30 @@ void Correlate(Status *stat) {
                 //print_frames(stat->frames);
                 auto common_keys = find_keys(stat->frames);
                 for (const auto& key : common_keys) {
+                    std::vector<zmq_msg_t *> parts;
+                    for (const auto& [port, trigger_map] : stat->frames) {
+                        auto it = trigger_map.find(key);
+                        if (it != trigger_map.end()) {
+                            parts.insert(parts.end(), stat->frames[port][key].begin(), stat->frames[port][key].end());
+                            std::cout << "  Key " << key << " found in map " << port << std::endl;
+                            stat->frames[port].erase(key);
+                        }
+                    }
                     std::cout << key << " ";
+                    zmq_send_multipart(socket, parts);
                 }
                 std::cout << "\n\n";
             }
+            if (stat->ends.size() == stat->num_receivers) {
+                std::cout << "all ends received, flushing" << std::endl;
+                // clean up all remaining frames
+                zmq_send_multipart(socket, stat->ends);
+                stat->ends.clear();                
+            }
         }
     }
+    zmq_close(socket);
+    zmq_ctx_destroy(context);
 }
 
 /**
@@ -215,7 +262,7 @@ int StartAcq(const slsDetectorDefs::startCallbackHeader callbackHeader,
 
     std::ostringstream oss;
     oss << "{\"htype\":\"header\""
-        << ", \"udpPort\":" << sls::ToString(callbackHeader.udpPort)
+        << ", \"udpPorts\":" << sls::ToString(callbackHeader.udpPort)
         << ", \"filePath\":" << callbackHeader.filePath
         << "\"}\n";
     
@@ -230,6 +277,7 @@ int StartAcq(const slsDetectorDefs::startCallbackHeader callbackHeader,
     {
         std::lock_guard<std::mutex> lock(stat->mtx);
         stat->headers.push_back(hmsg);
+        stat->starting = true;
         for(int port: callbackHeader.udpPort) {
             std::cout << "clear cache for stream" << port << std::endl;
             for (auto& pair : stat->frames[port]) {
@@ -259,6 +307,27 @@ void AcquisitionFinished(
                           << "\n\tLast Frame Index : "
                           << sls::ToString(callbackHeader.lastFrameIndex)
                           << "\n\t]";
+
+    Status* stat = static_cast<Status*>(objectPointer);
+
+    std::ostringstream oss;
+    oss << "{\"htype\":\"series_end\""
+        << ", \"udpPorts\":" << sls::ToString(callbackHeader.udpPort)
+        << "\"}\n";
+    
+    std::string message = oss.str();
+    int length = message.length();
+    char* hdata = new char[length];
+
+    memcpy(hdata, message.c_str(), length);
+    zmq_msg_t *hmsg = new zmq_msg_t;
+    zmq_msg_init_data (hmsg, hdata, length, zmq_free, NULL);
+
+    {
+        std::lock_guard<std::mutex> lock(stat->mtx);
+        stat->ends.push_back(hmsg);
+    }
+    sem_post(&stat->available);
 }
 
 /**
@@ -428,7 +497,7 @@ int main(int argc, char *argv[]) {
         cprintf(RED, "Could not set handler function for SIGPIPE\n");
     }
 
-    Status stat{false, numReceivers};
+    Status stat{true, false, numReceivers};
 
     sem_init(&stat.available, 0, 0);