# Wireless Thermostat Device communication protocol

## Foreword

In the current section, we explain in detail what are the specific commands that the device supports. 

If you want to make yourself familiar with the details of how this device operates, please read through all articles.

**The device executes the LoRaWAN Join Procedure on SF9.**

## Communication concepts related to LoRaWAN standard

* Supported LoRaWAN MAC protocol version: 1.0.3;
* Supported LoRaWAN device Class: A;
* LoRaWAN MAC Port: 
  * Uplinks: 2. 
  * **Downlinks: 1, 2, 4-223;**
* Maximum application payload size: Maximum allowed by document “LoRaWAN regional parameters” for DataRate 0 for the given region. In most of the cases this is 51 bytes;
* Consult the document “LoRaWAN regional parameters” for additional technical information (Especially for RX2 window timings);