This mode uses the ESP8266 to provide WIFI for a microcontroller as WIFI-TO-SERIAL BRIDGE.

Setup

On the ESP8266 side the esp-link firmware is used
On the Arduino / Similar side the OpenDevice + el-client library is used.

To flash ESP follow this guide: https://github.com/jeelabs/esp-link/blob/master/FLASHING.md

Hardware Connections

Arduino	ESP8266
RX (0)	TX
TX (1)	RX

It is recommended to use an external power supply or converter to power the ESP8266

ESP-LINK Configuration

The communication between the ESP8266 and the server uses the MQTT protocol, for this we need:

Enable SLIP on Serial port
Enable MQTT
Disable DEBUG log
ClientID : ApiKey/ModuleName
Username: ApiKey
Password: x

Code

.....

Debug Information

You can enable debug information passing a second parameter.

#include <SoftwareSerial.h>
SoftwareSerial debugport(10,11); // RX, TX
EspLinkConnection conn(Serial, debugport);
// ...
Serial.begin(115200); // ESP-Link port (change to correct port)
debugport.begin(115200);

In Leonardo as it has two series, it does not need the SoftwareSerial

You can also see some debug information on the Esp-Link web console

References

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