MIcro:bit BLE send problem

Mbed OS
1

Hi to all,
program should send data as init function upon BLE connection. Android application MicrBIT uart not receiving data but move line forward. HEX data are 00.

I did try with
uart->send (“Connected”); as well as
uart->send(ManagedString(“Connected”));

I can send main.cpp for test if required.

I will appreciate any help with example how to use BLE send.
Thanks, Damir