diff --git a/src/business_logic/device.rs b/src/business_logic/device.rs
new file mode 100644
index 0000000..1f5c43a
--- /dev/null
+++ b/src/business_logic/device.rs
@@ -0,0 +1,161 @@
+use std::str::FromStr;
+
+use fred::prelude::{Client as RedisClient, HashesInterface, KeysInterface};
+use hifitime::Epoch;
+use rust_decimal::Decimal;
+use snafu::ResultExt;
+use uuid::{self, Uuid};
+
+use crate::{
+    ingest_protocol::NMDeviceDataPacket,
+    uformat,
+    web_server::{
+        app_error::{self, AppError, DecimalSnafu, ServerRedisSnafu, UuidSnafu},
+        old_device_sensor_api::qs_parser::DecimalParseSnafu,
+    },
+};
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, serde::Deserialize, serde::Serialize)]
+pub struct Device {
+    pub device_id: Uuid,
+
+    /// ID владельца
+    pub owner: Uuid,
+
+    pub lat: Option<Decimal>,
+    pub lon: Option<Decimal>,
+    pub alt: Option<Decimal>,
+
+    /// Данные датчика могут быть переданы только по TLS
+    pub tls_only: bool,
+
+    /// Данные датчика могут быть переданы только по Mutual TLS
+    pub mtls_only: bool,
+}
+
+impl Device {
+    pub fn new(id: Uuid, owner: Uuid) -> Device {
+        Device {
+            device_id: id,
+            owner,
+            lat: None,
+            lon: None,
+            alt: None,
+            tls_only: false,
+            mtls_only: false,
+        }
+    }
+
+    pub async fn get_by_id(redis: &RedisClient, id: Uuid) -> Result<Option<Device>, AppError> {
+        let key = uformat!("devices_{}", id.to_string());
+
+        if !redis.exists(&[&key]).await.context(ServerRedisSnafu)? {
+            return Ok(None);
+        }
+
+        return Ok(Some(Device {
+            device_id: id,
+            owner: redis
+                .hget::<Option<String>, _, _>(&key, "lat")
+                .await
+                .context(ServerRedisSnafu)?
+                .map(|el| Uuid::from_str(&el).context(UuidSnafu))
+                .transpose()?
+                .unwrap(),
+            lat: redis
+                .hget::<Option<String>, _, _>(&key, "lat")
+                .await
+                .context(ServerRedisSnafu)?
+                .map(|el| el.parse().context(DecimalSnafu))
+                .transpose()?,
+            lon: redis
+                .hget::<Option<String>, _, _>(&key, "lon")
+                .await
+                .context(ServerRedisSnafu)?
+                .map(|el| el.parse().context(DecimalSnafu))
+                .transpose()?,
+            alt: redis
+                .hget::<Option<String>, _, _>(&key, "alt")
+                .await
+                .context(ServerRedisSnafu)?
+                .map(|el| el.parse().context(DecimalSnafu))
+                .transpose()?,
+            tls_only: redis
+                .hget::<Option<bool>, _, _>(&key, "tls_only")
+                .await
+                .context(ServerRedisSnafu)?
+                .unwrap(),
+            mtls_only: redis
+                .hget::<Option<bool>, _, _>(&key, "mtls_only")
+                .await
+                .context(ServerRedisSnafu)?
+                .unwrap(),
+        }));
+    }
+
+    pub async fn save_to_db(
+        packet: &NMDeviceDataPacket,
+        redis: &RedisClient,
+    ) -> Result<(), AppError> {
+        let device_mac_enc = hex::encode(packet.mac);
+        let device_id_key = uformat!("devices_mac{}", &device_mac_enc);
+
+        let device_id: Option<String> = redis.get(device_id_key).await.context(ServerRedisSnafu)?;
+
+        let device_id = device_id.ok_or_else(|| AppError::DeviceNotFound {
+            mac: device_mac_enc.clone(),
+        })?;
+
+        let now = Epoch::now().unwrap().into();
+        let mut device_time = packet.time.unwrap_or(now);
+
+        // TODO: Добавить гистерезис
+        // Отчёт совместимости: отсутствует
+        if device_time > now {
+            device_time = now;
+        }
+
+        let device_tai_timestamp = device_time.0.to_duration_since_j1900().to_seconds();
+
+        let key = uformat!("devices_{}", device_id);
+
+        let device_exists: Option<bool> = redis
+            .hget(key.as_str(), "exists")
+            .await
+            .context(ServerRedisSnafu)?;
+
+        if !device_exists.is_some_and(|v| v) {
+            return Err(AppError::DeviceNotFound {
+                mac: hex::encode(packet.mac),
+            });
+        }
+
+        // devices_{device_id}_{tai_timestamp}_{sensor_id}
+        for sensor in &packet.values {
+            let key = uformat!(
+                "devices_{}_sensor{}_{}",
+                device_id,
+                sensor.mac,
+                device_tai_timestamp.to_string(),
+            );
+
+            () = redis
+                .set(key.as_str(), sensor.value.to_string(), None, None, false)
+                .await
+                .context(ServerRedisSnafu)?;
+        }
+
+        if let Some(commands) = &packet.commands {
+            for (cmd_key, cmd_value) in commands {
+                let key = uformat!("devices_{}_cmds_{}", device_id, cmd_key);
+
+                () = redis
+                    .set(key.as_str(), cmd_value, None, None, false)
+                    .await
+                    .context(ServerRedisSnafu)?;
+            }
+        }
+
+        Ok(())
+    }
+}
diff --git a/src/business_logic/mod.rs b/src/business_logic/mod.rs
new file mode 100644
index 0000000..4a2a358
--- /dev/null
+++ b/src/business_logic/mod.rs
@@ -0,0 +1,37 @@
+use bytes::Bytes;
+use device::Device;
+use fred::prelude::Client;
+use ntex::web::guard::Header;
+use ppp::v2::Header;
+use snafu::ResultExt;
+
+pub mod device;
+
+use crate::{
+    ingest_protocol::NMDeviceDataPacket,
+    web_server::app_error::{AppError, ServerRedisSnafu},
+};
+
+pub async fn process_packet(
+    r_client: Client,
+    packet: NMDeviceDataPacket,
+    proxy_header: Option<Bytes>,
+) -> String {
+    let proxy_ref = proxy_header.as_ref().map(|el| el.as_ref());
+    let proxy_header_parsed = proxy_ref.map(|el| Header::try_from(el).unwrap());
+    // proxy_header_parsed.unwrap().tlvs()
+
+    let asd: Result<String, AppError> = (|| async {
+        // TODO: Auth code here. Check if tls only is enabled.
+
+        Device::save_to_db(&packet, &r_client).await?;
+
+        return Ok("".to_string());
+    })()
+    .await;
+
+    return match asd {
+        Ok(resp) => resp,
+        Err(err) => format!("ERROR: {}", err),
+    };
+}
diff --git a/src/business_logic/user.rs b/src/business_logic/user.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/ingest_protocol/packet_types.rs b/src/ingest_protocol/packet_types.rs
index de8e5c8..723aeeb 100644
--- a/src/ingest_protocol/packet_types.rs
+++ b/src/ingest_protocol/packet_types.rs
@@ -6,6 +6,7 @@
 // #[serde(rename = "...")]
 // #[serde(alias = "...")]
 
+use crate::business_logic::device::Device;
 use crate::ingest_protocol::error::Error;
 use crate::ingest_protocol::parser::parse_mac_address;
 use crate::uformat;
@@ -98,64 +99,6 @@ pub struct NMDeviceDataPacket {
     pub time: Option<EpochUTC>,
 }
 
-impl NMDeviceDataPacket {
-    pub async fn save_to_db(&self, redis: &RedisClient) -> Result<(), AppError> {
-        let device_mac_enc = hex::encode(self.mac);
-
-        let now = Epoch::now().unwrap().into();
-        let mut device_time = self.time.unwrap_or(now);
-
-        // TODO: Добавить гистерезис
-        // Отчёт совместимости: отсутствует
-        if device_time > now {
-            device_time = now;
-        }
-
-        let device_tai_timestamp = device_time.0.to_duration_since_j1900().to_seconds();
-
-        let key = uformat!("devices_{}", device_mac_enc);
-
-        let device_exists: Option<bool> = redis
-            .hget(key.as_str(), "exists")
-            .await
-            .context(ServerRedisSnafu)?;
-
-        if !device_exists.is_some_and(|v| v) {
-            return Err(AppError::DeviceNotFound {
-                mac: hex::encode(self.mac),
-            });
-        }
-
-        // devices_{device_id}_{tai_timestamp}_{sensor_id}
-        for sensor in &self.values {
-            let key = uformat!(
-                "devices_{}_{}_{}",
-                device_mac_enc,
-                device_tai_timestamp.to_string(),
-                sensor.mac
-            );
-
-            redis
-                .set(key.as_str(), sensor.value.to_string(), None, None, false)
-                .await
-                .context(ServerRedisSnafu)?;
-        }
-
-        if let Some(commands) = &self.commands {
-            for (cmd_key, cmd_value) in commands {
-                let key = uformat!("devices_{}_cmds_{}", device_mac_enc, cmd_key);
-
-                redis
-                    .set(key.as_str(), cmd_value, None, None, false)
-                    .await
-                    .context(ServerRedisSnafu)?;
-            }
-        }
-
-        Ok(())
-    }
-}
-
 #[derive(Debug, Clone, Default, PartialEq, Deserialize)]
 pub struct NMJsonPacket {
     pub devices: Vec<NMDeviceDataPacket>,
@@ -164,7 +107,7 @@ pub struct NMJsonPacket {
 impl NMJsonPacket {
     pub async fn save_to_db(&self, redis: &RedisClient) -> Result<(), AppError> {
         for device in &self.devices {
-            device.save_to_db(redis).await?;
+            Device::save_to_db(&device, redis).await?;
         }
 
         Ok(())
diff --git a/src/main.rs b/src/main.rs
index 26a4243..cc3fa32 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #![doc = include_str!("../README.md")]
 extern crate core;
 
+mod business_logic;
 mod cli;
 mod ingest_protocol;
 mod ingest_socket_server;