diff --git a/examples/echoclient.py b/examples/echoclient.py
index 47ff799..d3bab95 100644
--- a/examples/echoclient.py
+++ b/examples/echoclient.py
@@ -6,7 +6,14 @@ def echo(msg: bytes) -> bytes:
 def log_bytes(data: bytes) -> None:
 	pass
 
+@imported('prelude')
+def sleep(seconds: u32) -> None:
+	pass
+
 @exported
 def on_module_loaded() -> None:
 	log_bytes(b'Echo client starting up, calling server')
+	sleep(8)
 	log_bytes(echo(b'Hello, world!'))
+	sleep(8)
+	log_bytes(echo(b'Bye, world!'))
diff --git a/examples/echoclient.toml b/examples/echoclient.toml
index fee6ef0..f3c66d0 100644
--- a/examples/echoclient.toml
+++ b/examples/echoclient.toml
@@ -6,6 +6,7 @@ path = "examples/echoclient.wasm"
 hash = "sha256@84cb22d12dfdd6b05cb906f6db83d59f473c9df85a33822f696344af2b92b502"
 
 imports = [
+	{ service = "prelude", method = "sleep", arg_types = ["u32"], return_type = "none"},
 	{ service = "echoserver", method = "echo", arg_types = ["bytes"], return_type = "bytes"},
 ]
 
diff --git a/phasmplatform/common/value.py b/phasmplatform/common/value.py
index 28c7547..d953057 100644
--- a/phasmplatform/common/value.py
+++ b/phasmplatform/common/value.py
@@ -2,7 +2,7 @@ from typing import Any, Union
 
 from .valuetype import ValueType, none
 
-ValueData = Union[None, bytes]
+ValueData = Union[None, int, float, bytes]
 
 
 class Value:
diff --git a/phasmplatform/common/valuetype.py b/phasmplatform/common/valuetype.py
index 2726fa1..c7153fb 100644
--- a/phasmplatform/common/valuetype.py
+++ b/phasmplatform/common/valuetype.py
@@ -19,11 +19,14 @@ class ValueType:
         return f'valuetype.{self.name}'
 
 
+u32 = ValueType('u32')
+
 bytes = ValueType('bytes')
 
 none = ValueType('none')
 
 LOOKUP_TABLE: Dict[str, ValueType] = {
+    u32.name: u32,
     bytes.name: bytes,
     none.name: none,
 }
diff --git a/phasmplatform/worker/__main__.py b/phasmplatform/worker/__main__.py
index 9f9fecf..334a675 100644
--- a/phasmplatform/worker/__main__.py
+++ b/phasmplatform/worker/__main__.py
@@ -201,9 +201,9 @@ class LocalhostMethodCallRouter(MethodCallRouterInterface):
 
 
 def make_prelude() -> Service:
-    methods: List[Method] = []
-
-    methods.append(Method('log_bytes', [valuetype.bytes], valuetype.none))
+    methods: List[Method] = [
+        Method('sleep', [valuetype.u32], valuetype.none),
+    ]
 
     return Service('prelude', ContainerMatch('__prelude__'), methods)
 
diff --git a/phasmplatform/worker/runners/base.py b/phasmplatform/worker/runners/base.py
index 7478459..dfaa621 100644
--- a/phasmplatform/worker/runners/base.py
+++ b/phasmplatform/worker/runners/base.py
@@ -63,6 +63,10 @@ class BaseRunner(RunnerInterface):
             assert val is None   # type hint
             return Value(value_type, None)
 
+        if value_type is valuetype.u32:
+            assert isinstance(val, int)   # type hint
+            return Value(value_type, val)
+
         if value_type is valuetype.bytes:
             assert isinstance(val, int)   # type hint
             return Value(value_type, self.read_bytes(val))
diff --git a/phasmplatform/worker/runners/prelude.py b/phasmplatform/worker/runners/prelude.py
index eedf266..55b1bc0 100644
--- a/phasmplatform/worker/runners/prelude.py
+++ b/phasmplatform/worker/runners/prelude.py
@@ -1,5 +1,7 @@
 from typing import Union
 
+import time
+
 from phasmplatform.common.methodcall import MethodCall, MethodCallError
 from phasmplatform.common.value import Value, NoneValue
 
@@ -14,4 +16,12 @@ class PreludeRunner(BaseRunner):
             self.container_log[0]('PreludeRunner loaded')
             return NoneValue
 
+        if call.method.name == 'sleep':
+            # This will block this thread
+            # Which is has to do until we can get the async really working
+            seconds = call.args[0].data
+            assert isinstance(seconds, int)  # type hint
+            time.sleep(seconds)
+            return NoneValue
+
         raise NotImplementedError(call)
diff --git a/phasmplatform/worker/runners/wasmtime.py b/phasmplatform/worker/runners/wasmtime.py
index 96b2f71..deb9d88 100644
--- a/phasmplatform/worker/runners/wasmtime.py
+++ b/phasmplatform/worker/runners/wasmtime.py
@@ -152,6 +152,9 @@ def build_func_type(method: Method) -> wasmtime.FuncType:
 
 
 def build_wasm_type(value_type: ValueType) -> wasmtime.ValType:
+    if value_type is valuetype.u32:
+        return wasmtime.ValType.i32()  # Signed-ness is in the operands
+
     if value_type is valuetype.bytes:
         return wasmtime.ValType.i32()  # Bytes are passed as pointer