# Bluetooth LE Service Get List

To exchange information with a BLE device is useful to understand the Generic Attribute Profile (GATT). To simplify GATT is organized: one device can have multiple Services. Service has Chracteristic’s and Chracteristic’s has Descriptor’s. So to read/write one value (Descriptor) you need to know which device, service and characteristic you want to read/write. This action get you the list of Services available.

Action available for the following operating systems:

![](/files/kfMeq0OanEe5OOx5RmUn)

### Parameters

*Targets*

* **Separator** *\<string>* - By Default CR
* **Timeout (ms)** *\<numeric>* - Value in Milliseconds
* **Target for Name** *\<unquoted string>* - Control or variable to storage the value.
* **Target Count** *\<unquoted string>* - Control or variable to storage the value.

{% hint style="info" %}
For more information that helps the use of this action you can consult the following links:

<https://www.bluetooth.com/specifications/gatt/services/>\
<https://www.bluetooth.com/specifications/gatt/characteristics/>
{% endhint %}

{% hint style="warning" %}
On iOS some services are filtered by the O.S. and you cannot access the, like 0x1800 (Generic Access) or iBeacon related services.
{% endhint %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://doc.sysdevmobile.com/kalipso5/developing/form/actions/actions-description/group-communications/bluetooth-le-service-get-list.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.