ble_blinky

[s_sen]

HELLO SIR 

we are working on our current project on bluetooth .we are currently trying to broadcast data over bluetooth from one DK to others . we are trying to modify the ble_multilink_central example , and the ble blinky . the problem i am facing is to figure out the received buffer . it would be really helpful if you could point me as to where exactly is the received buffer stored .

SEGGER V3.50,      SDK 15.0,   DK Rigardo BMD300.

[MartinBL]

Hi,

In the BLE Blinky example the LED characteristic value is stored in a portion of RAM that is controlled by the softdevice. I.e. you are not allowed to access it directly, but you can use functions like sd_ble_gatts_value_get() and ..._set() to get or set the value. As in most of the BLE services in the SDK, there is a function called on_write() inside ble_lbs.c which is called whenever data is written to any of the characteristics. 

[s_sen]

ok thank you for the info, 

but could you be more specific , the function here is nrf_ble_gatt_att_mtu_central_set() & nrf_ble_gatt_att_mtu_peripheral_set(), i am using  SDK v15.0

[s_sen]

i am trying to print the data 

and here too 

the data is just 1 or 0 

[MartinBL]

And what data do you transmit? 

p_evt_write->data[0]     -> Gives you the value of the first byte in the receive buffer

p_evt_write->data         -> Gives you a the address of the first byte in the receive buffer

If you expect more than one byte you might need to print 

p_evt_write->data[1]

p_evt_write->data[2] 

... and so on. 

[s_sen]

i am running the SDK  ble_multilink_central with ble_blinky i am expecting to see a frame of this format 

PREAMBLE | ACCESS ADDRESS | LL HEADER | DATA | CRC |

[MartinBL]

In your other case (#213381) it looks like you haven't quite figured out how to write data yet. I suggest we clear that up before we continue here. 

[s_sen]

fair enough then

thank you