ESP8266 as bridge

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

Setup

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

Hardware Connections

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);

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

References

• http://www.martyncurrey.com/arduino-to-esp8266-serial-commincation/
• https://github.com/jeelabs/el-client/tree/master/ELClient
• https://github.com/jeelabs/esp-link