diff --git a/.gitignore b/.gitignore
index 0e5ac79..2db7150 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .venv
-__pycache__
\ No newline at end of file
+__pycache__
+alerting/credentials.json
diff --git a/README.md b/README.md
index 94cbb2d..afdbfa8 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,17 @@
 # lego-monitoring
+
+## Prerequisites
+
+* `pacman -S libolm`
+* `pip -r requirements.txt`
+
+## Configuring
+
+* Run `alerting/login.py` once to generate credentials file
+* Invite the bot account to the room (you have to accept the invite manually)
+* Set room ID in `alerting/common.py`
+
+## Running
+
+* `prettyprint.py` -- check and print all sensors
+* TODO -- launch service
diff --git a/alerting/alerts.py b/alerting/alerts.py
new file mode 100644
index 0000000..15f0716
--- /dev/null
+++ b/alerting/alerts.py
@@ -0,0 +1,78 @@
+import json
+from dataclasses import dataclass
+from enum import Enum, StrEnum
+from typing import Optional
+
+import aiofiles
+import nio
+
+from alerting.common import CREDS_FILE, ROOM_ID
+
+
+class AlertType(StrEnum):
+    TEST = "TEST"
+    RAM = "RAM"  # TODO
+    CPU = "CPU"  # TODO
+    TEMP = "TEMP"  # TODO
+    LOGIN = "LOGIN"  # TODO
+    SMART = "SMART"  # TODO
+    RAID = "RAID"  # TODO
+
+
+class Severity(Enum):
+    INFO = 1
+    WARNING = 2
+    CRITICAL = 3
+
+
+@dataclass
+class Alert:
+    alert_type: AlertType
+    message: str
+    severity: Severity
+
+
+async def get_client() -> nio.AsyncClient:
+    """
+    Returns a Matrix client.
+    It is better to call get_client once and use it for multiple send_alert calls
+    """
+    async with aiofiles.open(CREDS_FILE) as f:
+        contents = await f.read()
+    creds = json.loads(contents)
+    client = nio.AsyncClient(creds["homeserver"])
+    client.access_token = creds["access_token"]
+    client.user_id = creds["user_id"]
+    client.device_id = creds["device_id"]
+    return client
+
+
+def format_message(alert: Alert) -> str:
+    match alert.severity:
+        case Severity.INFO:
+            severity_emoji = "ℹ️"
+        case Severity.WARNING:
+            severity_emoji = "⚠️"
+        case Severity.CRITICAL:
+            severity_emoji = "🆘"
+    message = f"{severity_emoji} {alert.alert_type} Alert\n{alert.message}"
+    return message
+
+
+async def send_alert(alert: Alert, client: Optional[nio.AsyncClient] = None) -> None:
+    if client is None:
+        temp_client = True
+        client = await get_client()
+    else:
+        temp_client = False
+    message = format_message(alert)
+    await client.room_send(
+        room_id=ROOM_ID,
+        message_type="m.room.message",
+        content={
+            "msgtype": "m.text",
+            "body": message,
+        },
+    )
+    if temp_client:
+        await client.close()
diff --git a/alerting/common.py b/alerting/common.py
new file mode 100644
index 0000000..15d517b
--- /dev/null
+++ b/alerting/common.py
@@ -0,0 +1,8 @@
+import os
+from pathlib import Path
+
+CREDS_FILE = (Path(os.path.dirname(os.path.realpath(__file__))) / "credentials.json").resolve()
+HOMESERVER = "https://matrix.altau.su"
+USER_ID = "@AlertBot:altau.su"
+DEVICE_NAME = "lego"
+ROOM_ID = "!aSCaiSJfLHslrJrHiJ:altau.su"
diff --git a/alerting/login.py b/alerting/login.py
new file mode 100755
index 0000000..05581df
--- /dev/null
+++ b/alerting/login.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+import asyncio
+import getpass
+import json
+import os
+
+from common import CREDS_FILE, DEVICE_NAME, HOMESERVER, USER_ID
+from nio import AsyncClient, LoginResponse
+
+
+async def main() -> None:
+    if os.path.exists(CREDS_FILE):
+        print(f"Creds already configured in {CREDS_FILE}")
+        raise SystemExit
+
+    client = AsyncClient(HOMESERVER, USER_ID)
+    password = getpass.getpass()
+    resp = await client.login(password, device_name=DEVICE_NAME)
+    await client.close()
+    if isinstance(resp, LoginResponse):
+        open(CREDS_FILE, "w").close()
+        os.chmod(CREDS_FILE, 0o600)
+        with open(CREDS_FILE, "w") as f:
+            json.dump(
+                {
+                    "homeserver": HOMESERVER,
+                    "user_id": resp.user_id,
+                    "device_id": resp.device_id,
+                    "access_token": resp.access_token,
+                },
+                f,
+            )
+        print(f"Logged in as {resp.user_id}. Credentials saved to {CREDS_FILE}")
+    else:
+        raise Exception(f"Failed to log in: {resp}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/requirements.txt b/requirements.txt
index 69c8e04..ac76115 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 colorama==0.4.6
 psutil==5.9.8
+matrix-nio[e2e]==0.24.0