Data Transfer from HC-05 module crashes app

[unique]

Hi there,

I suspect that my HC-05 bluetooth module that is connected to a Arduino Mega 2560 is broken, but I want to make sure I don't have a problem in my code.
The project is pretty big, but the main issue can be boiled down to the following code snippets:
datatest.ino (357 Bytes)
datatest.aia (3.9 KB)

I am able to connect my phone to the HC-05, but no data is transmitted and the app instantly freezes after. Also, I have been able to transmit data in the past with the same wiring (VCC to 3.3V, GND to GND, TXD to RX0, RXD to TX0), but the code has changed since and I am using a different phone.

I appretiate any help, thanks in advance. It's the middle of the night here, so I will probably not react to suggestions for the next couple of hours.

[Juan_Antonio]

Here an example with HC-05

HC-05 Bluetooth. Arduino. Change baud rate 38400. Send random to app

Hello friends, To carry out applications with Bluetooth between Arduino and App Inventor, the HC-06 module is usually used. This module can only work as a client, enough for most of the projects that you will see in the tutorials, it is the most used and recommended. Default 9600. [bluetooth1] Another similar module is the HC-05, this can function as a server or a client. You may have to set the speed using AT commands to adapt it to App Inventor. It comes with 38400 baud and you will have t…