Gateway for data exchange between ESP-NOW devices and MQTT broker via WiFi.
## Features
1. The first time turn on (or after rebooting) creates an access point named "ESP-NOW Gateway XXXXXXXXXXXX" with password "12345678" (IP 192.168.4.1) if fails to connect to WiFi. In case of lost a WiFi connection after successfuly connection search the required WiFi SSID availability every 30 seconds.
2. Possibility a device search through the Windows Network Environment via SSDP.
3. Periodically transmission of system information to the MQTT broker (every 60 seconds) and availability status to the ESP-NOW network and to the MQTT broker (every 10 seconds).
4. Automatically adds gateway configuration to Home Assistan via MQTT discovery as a binary_sensor.
5. Possibility firmware update over OTA.
6. Web interface for settings.
## Notes
1. ESP-NOW mesh network based on the library [ZHNetwork](https://github.com/aZholtikov/ZHNetwork).
2. Regardless of the status of connections to WiFi or MQTT the device perform ESP-NOW node function.
3. For restart the device (without using the Web interface and only if MQTT connection established) send an "restart" command to the device's root topic (example - "homeassistant/gateway/70039F44BEF7").
## Attention
1. ESP-NOW network name must be set same of all another ESP-NOW devices in network.
2. Upload the "data" folder (with web interface) into the filesystem before flashing.
