spawner: Rely on blocking request instead of sleeping.

Author: freezy

README.md

@@ -12,7 +12,7 @@ Or, if you already have it:
 
 `pip install mpf mpf-mc --pre --upgrade`
 
-After that, `mpf --version` should return at least **MPF v0.55.0-dev.11**.
+After that, `mpf --version` should return at least **MPF v0.55.0-dev.12**.
 
 ## Usage
 

VisualPinball.Engine.Mpf.Test/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Threading.Tasks;
 using VisualPinball.Engine.Mpf;
 
@@ -9,6 +10,7 @@ class Program
 	{
 		static async Task Main(string[] args)
 		{
+			var s = Stopwatch.StartNew();
 			var mpfApi = new MpfApi(@"../../../VisualPinball.Engine.Mpf/machine");
 
 			await mpfApi.Launch();
@@ -18,7 +20,7 @@ await mpfApi.Start(new Dictionary<string, bool> {
 			});
 
 			var descr = await mpfApi.GetMachineDescription();
-			Console.WriteLine($"Description: {descr}");
+			Console.WriteLine($"Description: {descr} in {s.ElapsedMilliseconds}ms");
 		}
 	}
 }

VisualPinball.Engine.Mpf/MpfClient.cs

@@ -24,7 +24,6 @@ public async Task Start(Dictionary<string, bool> initialSwitches)
 			var machineState = new MachineState();
 			machineState.InitialSwitchStates.Add(initialSwitches);
 			_client.Start(machineState);
-			await Task.Delay(1000); // TODO remove once it's blocking
 		}
 
 		public async Task<MachineDescription> GetMachineDescription() {