# BLE Transmit string not triggering Do \[Jan 2023\]

**URL:** https://community.thunkable.com/t/ble-transmit-string-not-triggering-do-jan-2023/2223455
**Category:** Issues / Bugs
**Tags:** beginner
**Created:** [January 15, 2023, 5:10pm UTC](https://community.thunkable.com/t/ble-transmit-string-not-triggering-do-jan-2023/2223455 "2023-01-15T17:10:01Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![helium4](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/helium4/32/145997_2.png) [@helium4](https://community.thunkable.com/u/helium4)
#### Post date: [January 15, 2023, 5:10pm UTC](https://community.thunkable.com/t/ble-transmit-string-not-triggering-do-jan-2023/2223455/1 "2023-01-15T17:10:01Z")

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Hi!  
I am having issue with a BLE Transmit string method. Using esp32-wroom and BLE UART standard example from arduino-esp32 library. Project was testing with thunkable android app.

I can connect to the esp32, no problem. When I call BLE transit string on button click it transmits string to esp32, but never execute Do section. The same problem is described here - [BLE Transmit never triggers DO](https://community.thunkable.com/t/ble-transmit-never-triggers-do/948114)

Here is my transmit string block. Set label’s text to Error doesn’t works - even Vibrate not executed. The connection part of the App executes Vibrate well.  
 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/7/a/7a2e0dc305e97ea3107348401a8700f8ff36dfdf.png)

And modified version  
 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/1/1/11d66974ce29642c49c2ded0ea1837a1548e6436.png)

Label with a debug output (label\_ble\_status\_info) newer shows “Done” and there are no phone vibration at all.

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<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: [November 8, 2024, 1:37pm UTC](https://community.thunkable.com/t/ble-transmit-string-not-triggering-do-jan-2023/2223455/2 "2024-11-08T13:37:11Z")

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