Published June 14, 2018 © MIT

Publish Any Event to Wia via Your Feather HUZZAH ESP8266

How to setup an Adafruit Feather HUZZAH ESP8266 and publish an event to Wia.

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Publish Any Event to Wia via Your Feather HUZZAH ESP8266

Things used in this project

Hardware components

Adafruit Feather HUZZAH with ESP8266 WiFi

Software apps and online services

Wia

Story

Setup Your Environment

Install the Arduino IDE (Integrated development environment). This is whereYou can download it for Mac OS X, Windows and Linux here.

Detailed instructions can be found below:

Installing the Arduino IDE for Windows

Installing the Arduino IDE for Mac

Installing the Arduino IDE for Linux

New to the Arduino IDE?

If you are completely unfamiliar with the Arduino IDE, watch this video here to give you a better understanding of how it works.

Start the Arduino application and open Preferences

Enter http://arduino.esp8266.com/stable/package_esp8266com_index.json into the Additional Board Manager URLs. If you need more than one, they can be separated with commas

Install the ESP8266 Arduino package

Go to Tools > Board > Boards Manager

Search for esp8266. When found, click Install

Select your ESP8266 board type by going to Tools > Board, then choosing your type. For this example, you can use NodeMCU 1.0 (ESP-12E Module)

Check that Upload Speed is set to 115200

Select the correct port for the board

When selecting a port

For the ESP 8266, the port names tend to have unusual names, e.g: On Mac OS: /dev/tty.usb.modem8232 or /dev/cu.SLAB_USB_toUART On Windows: Com4 or Com3 On Linux /dev/ttyUSB0 or /dev/ttyACM0

USB to UART Drivers Required

If your port is not showing up, you need to install USB to UART Bridge VCP drivers. To do so, go here, then download and install the drivers for your operating system.After installing the drivers, restart the Arduino IDE.

Note for Mac users

You may need to install the driver twice for it to work, as the first install will just remove the existing driver.

Charge-only USB cables

Another cause of the port not showing up could be the USB cable - make sure that the cable you're using is not a charge-only cable, and that it isn't faulty.

Create the Sketch

Click on File > New to create a new Sketch

Copy and paste the PublishEvent.ino example code below. You can also view it on GitHub here. In that directly you will see how to publish both Events and Locations

Replace the values of the following variables:

ssid - with your WiFi network name.

password - with your WiFi network password.

device_secret_key with your device secret key from the Wia Dashboard (the one that begins with d_sk).

Go to Sketch > Upload to send it to your ESP8266.

Now go to your device in the Wia dashboard and you should see the data appearing in the debugger.

Wia Device Debugger

Common errors

If you encounter an error like the one denoted in the image below, check if your board and port are correctly set in the Tools menu

Board or Port Failure

PublishEvent.ino

/**
 * PublishEvent.ino
 *
 *  Created on: 09.04.2018
 *
 */

#include <Arduino.h>

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <ESP8266HTTPClient.h>

#define USE_SERIAL Serial

ESP8266WiFiMulti WiFiMulti;

const char* ssid     = "your-ssid";
const char* password = "your-password";

// get this from the wia dashboard. it should start with `d_sk`
const char* device_secret_key = "your-device-secret-key";

void setup() {
    USE_SERIAL.begin(115200);
    //USE_SERIAL.setDebugOutput(true);

    WiFi.mode(WIFI_STA);
    WiFiMulti.addAP(ssid, password);
}

void loop() {
    // wait for WiFi connection
    if((WiFiMulti.run() == WL_CONNECTED)) {
        HTTPClient http;

        USE_SERIAL.print("[HTTP] begin...\n");

        // configure wia rest api
        http.begin("http://api.wia.io/v1/events");

        USE_SERIAL.print("[HTTP] POST...\n");

        // set authorization token
        http.addHeader("Authorization", "Bearer " + String(device_secret_key));

        // set content-type to json
        http.addHeader("Content-Type", "application/json");

        // start connection and send HTTP headers. replace name and data values with your own.
        int httpCode = http.POST("{\"name\":\"temperature\",\"data\":21.5}");

        // httpCode will be negative on error
        if(httpCode > 0) {
            // HTTP header has been send and Server response header has been handled
            USE_SERIAL.printf("[HTTP] POST... code: %d\n", httpCode);

            // file found at server
            if(httpCode == HTTP_CODE_OK) {
                String payload = http.getString();
                USE_SERIAL.println(payload);
            }
        } else {
            USE_SERIAL.printf("[HTTP] POST... failed, error: %s\n", http.errorToString(httpCode).c_str());
        }

        http.end();
    }

    delay(10000);
}

Credits

Spivey

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Publish Any Event to Wia via Your Feather HUZZAH ESP8266

Publish Any Event to Wia via Your Feather HUZZAH ESP8266

Things used in this project

Hardware components

Software apps and online services

Story

Setup Your Environment

New to the Arduino IDE?

When selecting a port

USB to UART Drivers Required

Note for Mac users

Charge-only USB cables

Create the Sketch

Common errors

Code

PublishEvent.ino

Credits

Spivey

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