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# <p align="center">Farm Data Relay System
##### <p align="center">[***In loving memory of Gay Holman, an extraordinary woman.***](https://www.facebook.com/CFECI/posts/2967989419953119) #####
The Farm Data Relay System is an easy way to link remote sensors to the internet without the need for WiFi. It is based around the ESP-NOW protocol, which is readily available on ESP32 and ESP8266 microcontroller boards. The system can be used to collect and transmit sensor data in situations where it would be too difficult or energy-consuming to provide full WiFi coverage.
The Farm Data Relay System is an easy way to collect data from remote sensors without relying on WiFi. It is based around the ESP-NOW protocol, which is readily available on ESP32 and ESP8266 microcontroller boards. The system can be used to collect and transmit sensor data in situations where it would be too difficult or energy-consuming to provide full WiFi coverage.
Using an assigned MAC address scheme allows for the whole system to be configured by setting just a handful of values in code. Every ESP-NOW gateway is assigned a single-byte identifier, known as the UNIT_MAC. This, along with a set 5-byte prefix is assigned to the MAC address of the ESP's radio at boot.
Using an assigned MAC address scheme allows for the whole system to be configured by setting just a handful of values in code. Every wireless gateway is assigned a single-byte identifier, known as the UNIT_MAC. This, along with a set, 5-byte prefix is assigned to the MAC address of the ESP's radio at boot.
Gateways can be configured to send an ESP-NOW transmission either to the serial port using JSON, another ESP-NOW gateway, or broadcast it via LoRa PHY. An incoming transmission from the serial port can also be routed to the same interfaces, with the addition of MQTT.
Gateways can be configured to send an ESP-NOW transmission to the serial port using JSON, another ESP-NOW gateway, or broadcast it via LoRa PHY. They can also be configured to transmit incoming serial packets over MQTT, ESP-NOW, or LoRa PHY.
## Getting Started
To use FDRS with Node-Red and MQTT you'll need two ESP devices (gateways) that are connected via UART, plus additional ESP or LoRa devices with sensors connected.