diff --git a/fixtures.py b/fixtures.py
new file mode 100644
index 0000000..aa51400
--- /dev/null
+++ b/fixtures.py
@@ -0,0 +1,19 @@
+import time
+
+from models import SensorData
+
+
+cur_time = int(time.time())
+device_mac = '9B-89-A9-ED-F2-FB'
+device_name = 'My RaspberryPi 4B'
+sensors = [
+    SensorData('owner', 'darkcat09'),
+    SensorData('lat', 56),  # just random data
+    SensorData('lon', 49),
+    SensorData('alt', 400),
+    SensorData('t1', 12.42, cur_time),  # let it be temp outdoors
+    SensorData('t2', 22.50, cur_time, 'Temp in living room'),
+    SensorData('t3', 60.11, None, 'Poor Raspberry CPU...'),
+    SensorData('p1', 752.33, None, 'Barometer'),
+    SensorData('p2', 751.42),
+]
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..c1d679f
--- /dev/null
+++ b/main.py
@@ -0,0 +1,30 @@
+import socket
+import urllib
+
+from unittest import TestCase
+
+from fixtures import device_mac, device_name, sensors
+
+
+TCP_ADDR = ('127.0.0.1', 8283)
+UDP_ADDR = ('127.0.0.1', 8283)
+HTTP_URL = 'http://127.0.0.1:8080'
+
+
+class TestTCP(TestCase):
+
+    def setUp(self) -> None:
+        self.sock = socket.socket()
+        self.sock.connect(TCP_ADDR)
+
+    def test_nm(self) -> None:
+        self.sock.sendall(b'')  # TODO
+        self._wait_for_ok()
+
+    def test_json(self) -> None:
+        self.sock.sendall(b'')  # TODO
+        self._wait_for_ok()
+
+    def _wait_for_ok(self) -> None:
+        data = self.sock.recv(1024)
+        self.assertEqual(data, b'OK')
diff --git a/models.py b/models.py
new file mode 100644
index 0000000..04d769a
--- /dev/null
+++ b/models.py
@@ -0,0 +1,10 @@
+from dataclasses import dataclass
+from typing import Any
+
+
+@dataclass
+class SensorData:
+    mac: str
+    value: Any
+    time: int | None = None
+    name: str | None = None