# BLE Characteristic UUID issues sending Data

**URL:** <https://community.thunkable.com/t/ble-characteristic-uuid-issues-sending-data/3334160>\
**Category:** BLE / BlueTooth\
**Tags:** bluetooth\
**Created:** [November 10, 2024, 3:31pm UTC](https://community.thunkable.com/t/ble-characteristic-uuid-issues-sending-data/3334160 "2024-11-10T15:31:42Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)\
**Post date:** [November 11, 2024, 7:03pm UTC](https://community.thunkable.com/t/ble-characteristic-uuid-issues-sending-data/3334160/2 "2024-11-11T19:03:44Z")

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Hello @rhino-led  
The issue is happening because the UUID is not set correctly.  
If the documentation only gives four characters for the value, they are assuming you’ll use the default characteristic UUID.

It is discussed more in this previous topic: [Trying to connect Bluetooth BP cuff, but struggling with the "characteristic UUID" stuff - #4 by muneer](https://community.thunkable.com/t/trying-to-connect-bluetooth-bp-cuff-but-struggling-with-the-characteristic-uuid-stuff/1849525/4)

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