diff --git a/gateway/README.md b/gateway/README.md
index 216a099..8b3af7a 100644
--- a/gateway/README.md
+++ b/gateway/README.md
@@ -1,15 +1,131 @@
 # A gateway for 433 MHz devices
 It uses [rc_switch](https://github.com/sui77/rc-switch) library for controlling wall sockets.
 
-It also supports receiving commands from the same protocol.
+It supports receiving:
+- serial commands for controlling wall switches - all protocols
+- RC commands from wall switches remotes - protocols 1 and 2
+- sensors states over `Protocol 2`
 
-It acts as a serial gateway and it is connected to a Raspberry Pi running Home assistant.
+It acts as a serial gateway, communicating in JSON format, and it is connected to a Raspberry Pi running Home Assistant.
 
 It uses an Arduino Pro Mini 5v 16 Mhz.
 The original bootloader has been replaced with Optiboot using this tutorial: https://andreasrohner.at/posts/Electronics/How-to-make-the-Watchdog-Timer-work-on-an-Arduino-Pro-Mini-by-replacing-the-bootloader/
 
-## Read sensors
+## Receive RC
+### Sensors
+Sensors transmit state using `Protocol 2` and the gateway translates them into JSON over serial.
+##### Protocol structure
+```
+1001 0 110000000 0000011101011 11001
+ |   |      |          |         |
+ | STATE  VALUE       VCC        ID
+TYPE
+```
+##### Sensors types
+```C++
+enum SensorType : unsigned short {
+	GENERIC = 4,
+	HUMIDITY = 5,
+	TEMPERATURE = 6,
+	CONTACT = 7
+};
+```
+##### Sensors IDs
+```C++
+enum SensorId : unsigned short {
+	WINDOW1 = 1,
+	WINDOW2 = 2,
+	WATER_SENSOR = 3,
+	TEMP_SENSOR = 4,
+	LIGHT_SENSOR = 5,
+	MOVEMENT_SENSOR = 6,
+	OIL_SENSOR = 7
+};
+```
+#### Stairs temperature
+##### Value and volatage
+```json
+{
+  "sensor": {
+    "id": 4,
+    "diagnostic": {
+      "voltage": 2.239
+    },
+    "temperature": 16.2
+  }
+}
+```
+##### Value only
+```json
+{
+  "sensor": {
+    "id": 4,
+    "temperature": 16.2
+  }
+}
+```
+#### Oil sensor
+##### Value and volatage
+```json
+{
+  "sensor": {
+    "id": 7,
+    "diagnostic": {
+      "voltage": 4.282
+    },
+    "value": 13
+  }
+}
+```
+### Switches
+Gateway receives remote commands over RC Switch and translates them into JSON over serial
+#### Protocol 1
+##### on
+```json
+{
+  "rcSwitch": {
+    "protocol": 1,
+    "state": true,
+    "group": "1",
+    "channel": 1,
+    "raw_value": 5571921
+  }
+}
+```
+##### off
+```json
+{
+  "rcSwitch": {
+    "protocol": 1,
+    "state": false,
+    "group": "1",
+    "channel": 1,
+    "raw_value": 5571921
+  }
+}
+```
+
+#### Protocol 2
+```json
+{
+  "rcSwitch": {
+    "protocol": 2,
+    "value": 2650807673
+  }
+}
+```
+
+#### Other protocols
+```json
+{
+  "rcSwitch": {
+    "protocol": 4,
+    "value": 1234567890
+  }
+}
+```
 ### DHT
+Reads local DHT11 sensor and outputs JSON over serial
 ```
 {
   "dht11": {
@@ -18,40 +134,49 @@ The original bootloader has been replaced with Optiboot using this tutorial: htt
   }
 }
 ```
-### RC Switch
-#### on
-```
-[
-  {
-    "rcSwitch": {
-      "protocol": 1,
-      "group": "00001",
-      "channel": 1,
-      "state": true
-    }
+---
+## Receive commands
+It receives commands over serial, in JSON format, and executes them.
+#### Protocol 1
+##### on
+```json
+{
+  "rcSwitch": {
+    "protocol": 1,
+    "group": "00001",
+    "channel": 1,
+    "state": true
   }
-]
+}
 ```
-#### off
-```
-[
-  {
-    "rcSwitch": {
-      "protocol": 1,
-      "group": "00001",
-      "channel": 1,
-      "state": false
-    }
+##### off
+```json
+{
+  "rcSwitch": {
+    "protocol": 1,
+    "group": "00001",
+    "channel": 1,
+    "state": false
   }
-]
+}
 ```
-```
-[
-  {
-    "rcSwitch": {
-      "protocol": 2,
-      "value": "10011110000000000001110101111001"
-    }
+
+#### Protocol 2
+```json
+{
+  "rcSwitch": {
+    "protocol": 2,
+    "value": "10010110000000000001110101111001"
   }
-]
-```
\ No newline at end of file
+}
+```
+
+#### Other protocols
+```json
+{
+  "rcSwitch": {
+    "protocol": 4,
+    "value": "010001101001100101110100"
+  }
+}
+```