ESP32_ChinaDieselHeater_Con.../lib/esp32FOTA/README.md

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# esp32FOTA library for Arduino
## Purpose
A simple library to add support for Over-The-Air (OTA) updates to your project.
## Features
- [x] Web update (requires web server)
- [x] Batch firmware sync
- [ ] Multi firmware update record
- [ ] Stream update (e.g. MQTT or other)
## How it works
This library tries to access a JSON file hosted on a webserver, and reviews it to decide if a newer firmware has been published, if so it will download it and install it.
There are a few things that need to be inplace for an update to work.
- A webserver with the firmware information in a JSON file
- Firmware version
- Firmware type
- Firmware bin
## Usage
### Hosted JSON
This is hosted by a webserver and contains information about the latest firmware
```json
{
"type": "esp32-fota-http",
"version": 2,
"host": "192.168.0.100",
"port": 80,
"bin": "/fota/esp32-fota-http-2.bin"
}
```
#### Firemare types
Types are used to compare with the current loaded firmware, this is used to make sure that when loaded the devie will still to the intended job.
As an example a device used as a data logger should ony be updated with new versions of the data logger.
##### examples
- TTGO-T8-ESP32-Logger
- TTGO-T8-ESP32-Temp
- TTGO-T8-ESP32-Relay
### Sketch
In this example a version 1 of 'esp32-fota-http' is in use, it would be updated when using the JSON example.
```cpp
#include <esp32fota.h>
#include <WiFi.h>
const char *ssid = "";
const char *password = "";
esp32FOTA esp32FOTA("esp32-fota-http", 1);
void setup()
{
esp32FOTA.checkURL = "http://server/fota/fota.json";
Serial.begin(115200);
setup_wifi();
}
void setup_wifi()
{
delay(10);
Serial.print("Connecting to ");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
}
void loop()
{
bool updatedNeeded = esp32FOTA.execHTTPcheck();
if (updatedNeeded)
{
esp32FOTA.execOTA();
}
delay(2000);
}
```