---
name: "onMqttConnectState"
mode: "kit"
versionRequirements:
  - { name: "DeviceKit", version: "2.5.1" }
platform:
  - "iOS"
  - "Android"
async: true
---

## onMqttConnectState

> [VERSION] DeviceKit >= 2.5.1

> [PLATFORM] iOS, Android

> ⚡ **Supports Promise** — Returns a Promise when success / fail / complete callbacks are omitted.

### Description

mqtt connection status change event

### Parameters

`(listener: Function)`

| Parameter | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `listener` | `(params: MqttConnectStateResponse) => void` | Yes | - | Event listener callback function |

### Referenced Types

##### `interface` MqttConnectStateResponse

| Property | Type | Since | Description |
| --- | --- | --- | --- |
| `connectState` | `number` | `2.5.1` | MQTT connection status 0 Connection failed 1 Connection successful |