# BLE Receive String Fails

**URL:** https://community.thunkable.com/t/ble-receive-string-fails/3697592
**Category:** BLE / BlueTooth
**Created:** [March 28, 2025, 11:03pm UTC](https://community.thunkable.com/t/ble-receive-string-fails/3697592 "2025-03-28T23:03:13Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![jgustafson05pf1zos](https://avatars.discourse-cdn.com/v4/letter/j/f08c70/32.png) [@jgustafson05pf1zos](https://community.thunkable.com/u/jgustafson05pf1zos)
#### Post date: [March 28, 2025, 11:03pm UTC](https://community.thunkable.com/t/ble-receive-string-fails/3697592/1 "2025-03-28T23:03:13Z")

</div>

In my project I am able to transmit data just fine, but for some reason the receive string block always fails. I have confirmed the UUID is correct, and I have confirmed in my code that just a simple string of 3 comma separated values are sent. I can read the string from the board using LightBlue for that same characteristic. It only fails with the receive string block. Any tips on troubleshooting? Error is not particularly informative. Thanks!

 ![Screenshot 2025-03-28 at 5.50.58 PM](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/6/5/655e0236d1cc9276eed25b4089e67439db745932.png)  
 ![BLE_error](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/e/0/e04e888e377895a63b2bad47ae893a52567afed3.jpeg)  
 ![Screenshot 2025-03-28 at 6.04.21 PM](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/6/065ebff0d0981d6c06bc86b586ca20d1abf2e7e9.png)

---

<div class="post-metadata">

### 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: [April 1, 2025, 11:08pm UTC](https://community.thunkable.com/t/ble-receive-string-fails/3697592/2 "2025-04-01T23:08:51Z")

</div>

Hello @jgustafson05pf1zos  
Based in your screenshot, doesn’t transmit strings; it broadcasts strings (notify method).  
This means that you will need to use the BLE blocks [“Subscribe To Characteristics” and “Characteristics Change”](https://docs.thunkable.com/blocks/advanced-app-features/bluetooth-low-energy#subscribe-to-characteristics) to subscribe to peripheral device’s characteristics and receiving data.