BluetoothChat transmitted data is split

I am using Bluetooth to transmit data in my app to my device, where I display the received data.

I used parts of the BluetoothChat component to connect with other devices and manage the transmission. If I send data from another smartphone using BluetoothChat, it is correctly displayed in my app. But if I send the data from an external bluetooth module (Rn42 in my case), the received data are sometimes split.

For example, if I send 35, what I actually receive is 3 and 5. This also happens if I send the data using the BluetoothChat component.

Do you know what could be the problem ?

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