> For the complete documentation index, see [llms.txt](https://biot-ws.gitbook.io/biot-core/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://biot-ws.gitbook.io/biot-core/api/messages.md).

# Messages

## [sendTextMessageToDevice](https://github.com/BIoTws/biot-core/blob/master/core.js#L191)

Sending text message to device address

**Params:**

      device\_address - **{string}** - Device address

      text - **{string}** - Message text

{% tabs %}
{% tab title="JS module" %}

```javascript
core.sendTextMessageToDevice('0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364', 'Hello!')
```

{% endtab %}

{% tab title="CLI" %}

```bash
biot-core sendTextMessageToDevice 0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364 Hello!
```

{% endtab %}

{% tab title="RPC" %}

```javascript
client.request('sendTextMessageToDevice', ['0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364', 'Hello!'], (err, data) => {
    if(err)
        throw err;

    console.log(data);
});
```

{% endtab %}

{% tab title="WS" %}

```javascript
let message_id = id++;
socket.send(JSON.stringify({
	id: message_id,
	name: 'sendTextMessageToDevice',
	args: ['0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364', 'Hello!']
}));
```

{% endtab %}
{% endtabs %}

## [sendTechMessageToDevice](https://github.com/BIoTws/biot-core/blob/master/core.js#L203)

Sending tech message to device address

**Params:**

      device\_address - **{string}** - Device address

      object - **{**object**}** - Message object

{% tabs %}
{% tab title="JS module" %}

```javascript
core.sendTechMessageToDevice('0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364', {test: 'Hello!'})
```

{% endtab %}

{% tab title="CLI" %}

```bash
biot-core sendTechMessageToDevice 0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364 "{\"test\":\"Hello!\"}"
```

{% endtab %}

{% tab title="RPC" %}

```javascript
client.request('sendTextMessageToDevice', ['0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364', {test: 'Hello!'}], (err, data) => {
    if(err)
        throw err;

    console.log(data);
});
```

{% endtab %}

{% tab title="WS" %}

```javascript
socket.send(JSON.stringify({
    id: id++,
    name: 'sendTextMessageToDevice',
    args: ['0PZT5VOY5AINZKW2SJ3Z7O4IDQNKPV364', {test: 'Hello!'}]
}));
```

{% endtab %}
{% endtabs %}

## How to use?

```javascript
const eventBus = require('byteballcore/event_bus');

eventBus.on('text', (from_address, text) => {
	let objMessage;
	try {
		objMessage = JSON.parse(text);
		if (objMessage.id || objMessage.version) objMessage = null;
	} catch (e) {
	}
	
	if (objMessage) {
		// this is tech
	} else {
		// this is text
	}
});
```

{% hint style="warning" %}
In the near future, "tech" will have a separate handler
{% endhint %}