Network.erl fix stop returning too early

network:stop through terminate was using nonblocking call to stop network_port- so rapid stop/start would give the second network:start an old whereis(network_port) that was still shutting down, and lead to errors.

Now waits for port DOWN.

Signed-off-by: Peter M <petermm@gmail.com>

libs/eavmlib/src/network.erl

@@ -366,10 +366,25 @@ handle_info(Msg, State) ->
     {noreply, State}.
 
 %% @hidden
-terminate(_Reason, _State) ->
+%% Wait for port to be closed
+terminate(_Reason, State) ->
     Ref = make_ref(),
+    Pid = State#state.port,
+    PortMonitor = erlang:monitor(port, Pid),
     network_port ! {?SERVER, Ref, stop},
-    ok.
+    wait_for_port_close(PortMonitor, Pid).
+
+wait_for_port_close(PortMonitor, Pid) ->
+    receive
+        {'DOWN', PortMonitor, port, Pid, _DownReason} ->
+            ok;
+        _Other ->
+            % Handle unexpected messages if necessary
+            wait_for_port_close(PortMonitor, Pid)
+        % Timeout after 4000 milliseconds
+    after 4000 ->
+        {error, timeout}
+    end.
 
 %%
 %% Internal operations