Fix lost packets not being properly computed

packet-exchange/src/server.c

@@ -142,6 +142,8 @@ static void *packet_receiving_thread(void *p) {
 
       clock_gettime(CLOCK_MONOTONIC, &current);
 
+      current_packet_id = atoi(param->stats.packet_info.data);
+
       // If this is not the first received packet
       if (stats->packets_received) {
 
@@ -150,8 +152,7 @@ static void *packet_receiving_thread(void *p) {
         stats->max_interval = diff > stats->max_interval ? diff : stats->max_interval;
 
         // Check if packets were lost
-        current_packet_id = atoi(param->stats.packet_info.data);
-        param->stats.lost_packets += (current_packet_id - prev_packet_id) % 1000 - 1;
+        param->stats.lost_packets += (current_packet_id - prev_packet_id - 1) % 1000;
 
         if(enable_histograms) {
           dist_to_interval = (((int64_t)diff) - param->interval) / 1000;