# MTSCRA Delegate Methods 1-10

After issuing the methods in section 3 Important Information About Bluetooth LE, the MTSCRA SDK libraries will call these Delegate methods (callback functions) to provide the requested data and / or a detailed response. For details about data received by these functions, see the *Programmer's Manual (COMMANDS)* for the specific device with which you are communicating.

For details about registering Delegate methods, see the demo application included with the SDK.

#### trackDataReadyNotification <a href="#id-5.1_trackdatareadynotification" id="id-5.1_trackdatareadynotification"></a>

The SDK sends this notification when card data is available from the device.

#### &#x20;devConnectionNotification <a href="#id-5.2_devconnectionnotification" id="id-5.2_devconnectionnotification"></a>

The SDK sends this notification when the connection status of the device changes.

#### onDataReceived <a href="#id-5.3_ondatareceived" id="id-5.3_ondatareceived"></a>

Return a card object type with card swipe data.

<table data-header-hidden><thead><tr><th width="150.66668701171875" valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Parameter</td><td valign="top">Description</td></tr><tr><td valign="top">cardDataObj</td><td valign="top">MTCardData object</td></tr><tr><td valign="top">instance</td><td valign="top">Instance ID</td></tr></tbody></table>

#### cardSwipeDidStart <a href="#id-5.4_cardswipedidstart" id="id-5.4_cardswipedidstart"></a>

Card swipe has started.

<table data-header-hidden><thead><tr><th width="154" valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Parameter</td><td valign="top">Description</td></tr><tr><td valign="top">instance</td><td valign="top">Instance ID</td></tr></tbody></table>

#### cardSwipeDidGetTransError <a href="#id-5.5_cardswipedidgettranserror" id="id-5.5_cardswipedidgettranserror"></a>

Card swipe got an error during transmission.

#### onDeviceConnectionDidChange <a href="#id-5.6_ondeviceconnectiondidchange" id="id-5.6_ondeviceconnectiondidchange"></a>

Device connection changed whether from close to open or vice versa.

<table data-header-hidden><thead><tr><th width="159.3333740234375" valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Parameter</td><td valign="top">Description</td></tr><tr><td valign="top">deviceType</td><td valign="top">MTSCRADeviceType object</td></tr><tr><td valign="top"><p> </p><p>connected</p></td><td valign="top"><p>Boolean for connection state. True = Connected</p><p>False = Not connected</p></td></tr><tr><td valign="top">instance</td><td valign="top">Instance ID</td></tr></tbody></table>

#### bleReaderConnected <a href="#id-5.7_blereaderconnected" id="id-5.7_blereaderconnected"></a>

Bluetooth LE Reader was connected.

<table data-header-hidden><thead><tr><th width="152" valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Parameter</td><td valign="top">Description</td></tr><tr><td valign="top">peripheral</td><td valign="top">CBPeripheral object</td></tr></tbody></table>

#### bleReaderDidDisconnected <a href="#id-5.8_blereaderdiddisconnected" id="id-5.8_blereaderdiddisconnected"></a>

Bluetooth LE Reader was disconnected.

<table data-header-hidden><thead><tr><th width="160" valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Parameter</td><td valign="top">Description</td></tr><tr><td valign="top">connectionInfo</td><td valign="top">MTConnectionInfo object</td></tr></tbody></table>

#### bleReaderDidDiscoverPeripheral <a href="#id-5.9_blereaderdiddiscoverperipheral" id="id-5.9_blereaderdiddiscoverperipheral"></a>

Bluetooth LE Reader was discovered.

#### bleReaderStateUpdated <a href="#id-5.10_blereaderstateupdated" id="id-5.10_blereaderstateupdated"></a>

Bluetooth LE state changed. Enumerated possible values that would arrive via this delegate are:

<table data-header-hidden><thead><tr><th width="147.33331298828125" valign="top"></th><th valign="top"></th></tr></thead><tbody><tr><td valign="top">Parameter</td><td valign="top">Description</td></tr><tr><td valign="top">state</td><td valign="top">MTSCRABLEState</td></tr></tbody></table>


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