experiment with different startup regimes

rtsp.c

@@ -2687,6 +2687,15 @@ void handle_setup_2(rtsp_conn_info *conn, rtsp_message *req, rtsp_message *resp)
         // timingPeerList
         if (conn->airplay_stream_category == ptp_stream) {
           ptp_send_control_message_string("T"); // incidentally create the named SHM if necessary and remove all previous history
+          
+          if (ptp_shm_interface_open() == 0) {
+            debug(1,"shm interface opened successfully!");
+          } else {
+            warn("Unable to open the shm interface at SETUP!");  
+          }
+
+          
+          
           debug_log_rtsp_message(2, "SETUP \"PTP\" message", req);
           plist_t groupUUID = plist_dict_get_item(messagePlist, "groupUUID");
           if (groupUUID) {

scripts/shairport-sync.service.in

@@ -1,6 +1,9 @@
 [Unit]
 Description=Shairport Sync - AirPlay Audio Receiver
+Provides=shairport-sync.service
 After=sound.target
+Requires=nqptp.service
+Wants=nqptp.service
 Requires=avahi-daemon.service
 After=avahi-daemon.service
 Wants=network-online.target

shairport.c

@@ -2213,11 +2213,11 @@ int main(int argc, char **argv) {
 #ifdef CONFIG_AIRPLAY_2
   ptp_shm_interface_init();
   ptp_send_control_message_string("T"); // incidentally create the named SHM and remove all previous history
-  usleep(100000); // wait for it to get done (?)
+  usleep(1000000); // wait for it to get done (?)
   if (ptp_shm_interface_open() == 0) {
     debug(1,"shm interface opened successfully!");
   } else {
-    die("Unable to open the shm interface at startup!");  
+    warn("Unable to open the shm interface at startup!");  
   }
 #endif