# Functions of BLE #day7\_amebaiot

**URL:** <https://forum.amebaiot.com/t/functions-of-ble-day7-amebaiot/258>\
**Category:** General\
**Created:** [February 16, 2021, 4:59pm UTC](https://forum.amebaiot.com/t/functions-of-ble-day7-amebaiot/258 "2021-02-16T16:59:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Anmol\_Rattan\_Singh](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/anmol_rattan_singh/32/180_2.png) [@Anmol\_Rattan\_Singh](https://forum.amebaiot.com/u/Anmol_Rattan_Singh)\
**Post date:** [February 16, 2021, 4:59pm UTC](https://forum.amebaiot.com/t/functions-of-ble-day7-amebaiot/258/1 "2021-02-16T16:59:48Z")

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There are different types of connections available for the **BLE** device. A BLE connected item may have up to 4 different functions:

- The **“Broadcaster”** shall be used as a server. Thus, its purpose is to transfer data to a device on a regular basis, but it does not support any incoming connection.

- The **“Observer”** : In a second step, the device may only monitor and read the data sent by a “broadcaster”. In such a case, the object is not able to send any connection to the server.

- The **“Central”** usually consists of a smartphone or tablet. This device provides two different types of connection: either in advertising mode or in connected mode. It is leading the overall process as it triggers data transfer.

- The **“Peripheral”** device allows connections and data transfer with the ¨Central¨ on a periodical basis. This system´s goal is to ensure universal data transmission by using the standard process, so that other devices also may read and understand the data.

Also have a look on below picture to have some more clarity about the above concept.

![22-25-04-bigschema-fonctionnement-ble](https://us1.discourse-cdn.com/flex016/uploads/ameba/original/1X/cc554b44b3fcbc4808a14c2bc8baed6c4f64d28b.png)