XIAO nrf52840 ArduinoBLE 1 central, 2 peripherals

[raffiniert]

ok it did work simply by doing:

#define dataNum 32

and

union unionData {                   //Union for bit convertion 16 <--> 8
  float   dataBuff16[dataNum/2];
  uint8_t   dataBuff8[dataNum];
};

but if this is proper code I do really not know