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Send a String from Client to Central?

Hi, 

I'm new in Bluetooth an I want to try a "simple Project". I've connected 3 Peripherals (all nRF52832 Chips) with 1 Central (also a nRF52832 Chip) together. 

With the Multilink example on the Central and the Blinky example on the Peripherals, I can send the button state and recived it on the Central. 

So for my Project I need to Send a Data value from a sensor to the Central. This Data value is a normal String. 

How I can Send this String from the Peripheral truth BLE to the Central? Do I need another example as a base? 

Did any one has a example for this case? 

Thanks for your Help. 

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