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Getting Started

c++

Development System Installation

Sming supports multiple architectures. Choose the architecture of your choice to install the needed development software and toolchain(s).

/arch/esp8266/getting-started/index /arch/esp32/getting-started/index /arch/host/host-emulator

You can also try Sming without installing anything locally. We have an interactive tutorial that can be run directly from your browser.

Documentation

In addition to our online documentation, you can also generate a complete documentation locally by following these instructions </_inc/docs/README>.

Examples

The examples are a great way to learn the API and brush up your C/C++ knowledge. Once you have completed the installation of the development tools, you can get the latest source code.

git clone https://github.com/SmingHub/Sming.git

And check some of the examples.

Further documentation about the samples is available too.

Basic Blink

Blinking is something like the “Hello World” example for the embedded world. You can check it using the commands below:

cd Sming/samples
cd Basic_Blink
make # -- compiles the application
make flash # -- tries to upload the application to your ESP8266 device.

See Basic_Blink for more information.

Simple GPIO input/output

#define LED_PIN 2 // GPIO2
...
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH);

For a complete example take a look at the Basic_Blink sample.

Start Serial communication

Serial.begin(9600);
Serial.println("Hello Sming! Let's do smart things.");

Connect to WiFi

WifiStation.enable(true);
WifiStation.config("LOCAL-NETWORK", "123456789087"); // Put you SSID and Password here

Read DHT22 sensor

#include <Libraries/DHTesp/DHTesp.h> // This is just a popular Arduino library!

#define DHT_PIN 0 // GPIO0
DHTesp dht;

void init()
{
  dht.setup(DHT_PIN, DHTesp::DHT22);

  float h = dht.getHumidity();
  float t = dht.getTemperature();
}

Take a look at the code of the Humidity_DHT22 sample.

HTTP client

HttpClient thingSpeak;
...
thingSpeak.downloadString("http://api.thingspeak.com/update?key=XXXXXXX&field1=" + String(sensorValue), onDataSent);

void onDataSent(HttpClient& client, bool successful)
{
  if (successful) {
    Serial.println("Successful!");
  }
  else {
    Serial.println("Failed");
  }
}

For more examples take a look at the HttpClient, HttpClient_Instapush and HttpClient_ThingSpeak samples.

OTA application update based on rBoot

void OtaUpdate()
{
  uint8 slot;
  rboot_config bootconf;

  Serial.println("Updating...");

  // need a clean object, otherwise if run before and failed will not run again
  if (otaUpdater) {
    delete otaUpdater;
  }

  otaUpdater = new RbootHttpUpdater();

  // select rom slot to flash
  bootconf = rboot_get_config();
  slot = bootconf.current_rom;
  if (slot == 0) {
    slot = 1;
  }
  else {
    slot = 0;
  }

  // flash rom to position indicated in the rBoot config rom table
  otaUpdater->addItem(bootconf.roms[slot], ROM_0_URL);

  // and/or set a callback (called on failure or success without switching requested)
  otaUpdater->setCallback(OtaUpdate_CallBack);

  // start update
  otaUpdater->start();
}

For a complete example take a look at the Basic_rBoot sample.

Embedded HTTP Web Server

server.listen(80);
server.paths.set("/", onIndex);
server.paths.set("/hello", onHello);
server.paths.setDefault(onFile);

Serial.println("=== WEB SERVER STARTED ===");
Serial.println(WifiStation.getIP());

...

void onIndex(HttpRequest &request, HttpResponse &response)
{
  TemplateFileStream *tmpl = new TemplateFileStream("index.html");
  auto &vars = tmpl->variables();
  vars["counter"] = String(counter);
  vars["IP"] = WifiStation.getIP().toString();
  vars["MAC"] = WifiStation.getMacAddress().toString();
  response.sendTemplate(tmpl);
}

void onFile(HttpRequest &request, HttpResponse &response)
{
  String file = request.getPath();
  if (file[0] == '/')
    file = file.substring(1);

  response.setCache(86400, true);
  response.sendFile(file);
}

For more examples take a look at the HttpServer_ConfigNetwork, HttpServer_Bootstrap, HttpServer_WebSockets and HttpServer_AJAX samples.

Email client

SmtpClient emailClient;

emailClient.connect(Url("smtp://user:password@domain.com"));

MailMessage* mail = new MailMessage();
mail->from = "developers@sming";
mail->to = "iot-developers@world";
mail->subject = "Greetings from Sming";
mail->setBody("Hello");

FileStream* file= new FileStream("image.png");
mail->addAttachment(file);

emailClient.onMessageSent(onMailSent);
emailClient.send(mail);

...

int onMailSent(SmtpClient& client, int code, char* status)
{
    MailMessage* mail = client.getCurrentMessage();

    ...

    if(client.countPending() == 0) {
        client.quit();
    }

    return 0;
}

See the SmtpClient sample for details.

Live Debugging

Applications based on Sming Framework that are flashed and running on an ESP8266 device can be debugged using interactive debuggers. In order to debug an application it has to be re-compiled with the ENABLE_GDB=1 directive. And then flashed on the device. As shown below:

cd $SMING_HOME/../samples/LiveDebug
make clean
make ENABLE_GDB=1
make flashapp # <-- this will update only the application firmware.

Once the debuggable application is flashed on the device the developers have to run GDB. The easiest way to run the command-line GDB is to execute the following command:

make gdb

Developers using Eclipse CDT can have debugging sessions like the one below:

See LiveDebug sample for details.