Return bytes in models.create_*

main.py

@@ -29,12 +29,11 @@ class TestTCP(TestCase):
         self.sock.connect(TCP_ADDR)
 
     def test_nm(self) -> None:
-        self.sock.sendall(nm_req().encode('utf-8'))
+        self.sock.sendall(nm_req())
         self._wait_for_ok()
 
     def test_json(self) -> None:
-        self.sock.sendall(b'')  # TODO
-        self._wait_for_ok()
+        raise NotImplemented
 
     def _wait_for_ok(self) -> None:
         data = self.sock.recv(1024)

models.py

@@ -13,7 +13,7 @@ class SensorData:
 def create_nm_req(
         dev_mac: str,
         dev_name: str | None = None,
-        sensors: Iterable[SensorData] = ()) -> str:
+        sensors: Iterable[SensorData] = ()) -> bytes:
     '''Generate a NarodMon format (#mac#value) request'''
 
     res = '#' + dev_mac
@@ -29,4 +29,4 @@ def create_nm_req(
             res += '#' + s.name
         res += '\n'
 
-    return res
+    return res.encode('utf-8')