diff --git a/models.py b/models.py
index 17dbfbb..c0a0935 100644
--- a/models.py
+++ b/models.py
@@ -1,34 +1,92 @@
+from urllib.parse import quote
+
 from dataclasses import dataclass
-from typing import Any, Iterable
+from typing import Collection
+
+
+type Numeric = int | float
 
 
 @dataclass
 class SensorData:
     mac: str
-    value: Any
+    value: Numeric
+    # actually `time` is either decimal int,
+    # hex int or <date>T<time>+/-<timezone>
     time: int | None = None
     name: str | None = None
 
 
-def create_nm_req(
-        dev_mac: str,
-        dev_name: str | None = None,
-        sensors: Iterable[SensorData] = ()) -> bytes:
-    '''Generate a NarodMon format (#mac#value) request'''
+@dataclass
+class GeoPosition:
+    lat: Numeric
+    lon: Numeric
+    alt: Numeric
 
-    res = '#' + dev_mac
-    if dev_name is not None:
-        res += '#' + dev_name
-    res += '\n'
 
-    for s in sensors:
-        res += f'#{s.mac}#{s.value}'
-        if s.time is not None:
-            res += f'#{s.time}'
-        if s.name is not None:
-            res += '#' + s.name
+@dataclass
+class Device:
+    mac: str
+    name: str | None = None
+    owner: str | None = None
+    geopos: GeoPosition | None = None
+    sensors: Collection[SensorData] = ()
+
+    def nm_req_data(self) -> str:
+        '''Generate a NarodMon format (#mac#value) request body'''
+
+        res = '#' + self.mac
+        if self.name is not None:
+            res += '#' + self.name
         res += '\n'
 
-    res += '##'
+        if self.owner is not None:
+            res += '#OWNER#' + self.owner + '\n'
 
-    return res.encode('utf-8')
+        for s in self.sensors:
+            res += f'#{s.mac}#{s.value}'
+            if s.time is not None:
+                res += f'#{s.time}'
+            if s.name is not None:
+                res += '#' + s.name
+            res += '\n'
+
+        if self.geopos is not None:
+            res += (
+                f'#LAT#{self.geopos.lat}\n'
+                f'#LON#{self.geopos.lon}\n'
+                f'#ALT#{self.geopos.alt}\n'
+            )
+
+        res += '##'
+
+        return res
+
+    def http_req_data(self) -> str:
+        '''Generate an x-www-form-urlencoded format request body'''
+
+        res = 'ID=' + self.mac
+        # TODO: i didn't get how to pass device name in an HTTP request
+        # because narodmon docs are written incredibly well /sarcasm
+
+        for s in self.sensors:
+            res += f'&{s.mac}={s.value}'
+            if s.time is not None:
+                res += f'&time={s.time}'
+            if s.name is not None:
+                res += f'&name={quote(s.name)}'
+
+        if self.owner is not None:
+            res += '&owner=' + quote(self.owner)
+
+        if self.geopos is not None:
+            res += (
+                f'&lat={self.geopos.lat}'
+                f'&lon={self.geopos.lon}'
+                f'&alt={self.geopos.alt}'
+            )
+
+        return res
+
+    def json_req_data(self) -> str:
+        raise NotImplemented