diff --git a/flowd-rs/src/main.rs b/flowd-rs/src/main.rs
index d8c8262..7c58073 100644
--- a/flowd-rs/src/main.rs
+++ b/flowd-rs/src/main.rs
@@ -1886,11 +1886,29 @@ impl RuntimeRuntimePayload {
         Ok(String::from(""))    //TODO how to indicate "empty"? Does it maybe require at least "[]" or "{}"?
     }
 
-    fn packet(&mut self, payload: &RuntimePacketRequestPayload) -> std::result::Result<(), std::io::Error> {
+    fn packet(&mut self, payload: &RuntimePacketRequestPayload, graph_inout: &mut GraphInportOutportHolder) -> std::result::Result<(), std::io::Error> {
         //TODO check if graph exists and if that port actually exists
+        //TODO check payload datatype, schema, event (?) etc.
         //TODO implement and deliver to destination process
-        info!("runtime: got a packet: {:?}", payload);
-        Ok(())
+        info!("runtime: got a packet for port {}: {:?}", payload.port, payload.payload);
+        // deliver to destination process
+        if let Some(inports) = graph_inout.inports.as_mut() {
+            if let Some(inport) = inports.get_mut(payload.port.as_str()) {
+                while inport.sink.is_full() {
+                    // wait until non-full
+                    //TODO optimize
+                    inport.wakeup.as_ref().unwrap().unpark();   //TODO optimize
+                    thread::yield_now();
+                }
+                inport.sink.push(payload.payload.clone().into()).expect("push packet from graph inport into component failed");
+                inport.wakeup.as_ref().unwrap().unpark();   //TODO optimize
+                return Ok(());
+            } else {
+                return Err(std::io::Error::new(std::io::ErrorKind::NotFound, String::from("graph inport with that name not found")));
+            }
+        } else {
+            return Err(std::io::Error::new(std::io::ErrorKind::NotFound, String::from("no graph inports exist")));
+        }
     }
 
     //TODO the payload has unusual type -> can we really re-use it? Unify these three: RuntimePacketRequestPayload, RuntimePacketResponsePayload, RuntimePacketsentResponsePayload?