BLE communication function

[yuval]

hi, im using ble_app_uart and im trying to do a simple communication and data transfer over bluetooth with my iOS.i want to send from the Bluefruit app a byte (0x55 for example) , reiceve it with the nRF , toggle a pin , and transmit a byte (0xAA for example). im using to transmit ble_nus_string_send, but i cant find the function that receives the data (so i can breakpoint and se the value).

[Martin Lesund]

Hi yk9,

  The easiest solution for you would be to just turn on logging through RTT.

in sdk_config.h:

//==========================================================
// <e> NRF_LOG_BACKEND_RTT_ENABLED - nrf_log_backend_rtt - Log RTT backend
//==========================================================
#ifndef NRF_LOG_BACKEND_RTT_ENABLED
#define NRF_LOG_BACKEND_RTT_ENABLED 1
#endif

And switch default severity level to 4:

// <o> NRF_LOG_DEFAULT_LEVEL  - Default Severity level
 
// <0=> Off 
// <1=> Error 
// <2=> Warning 
// <3=> Info 
// <4=> Debug 

#ifndef NRF_LOG_DEFAULT_LEVEL
#define NRF_LOG_DEFAULT_LEVEL 4
#endif

 

Use J-link RTT viewer with these settings:

and you should be able to see what gets sent back and forth.

[yuval]

thanks,

my question is much simpler, i want 2 functions, transmit and receive. i want to communicate, via bluetooth, between my chip (on feather) and an app on my iPhone (Bluefruit for example).
I want my main() to  wait to receive 1 byte from the app and transmit 1 byte (acknowledge) back to the app .
can you help me find the easiest way to do that?

also , how can i debug (breakpoint?) it ?

[Martin Lesund]

Hi Yk9,

  Check out this debug thread and also this youtube tutorial.

 

Please use some time to study the "ble_app_uart" example and use the "nRF Connect" app so you can send back and forth data.

Also check out the NUS API and how this is used in the example. 

- you can for example use ble_nus_string_send() to send over BLE.

 

(Some tutorials which can be helpful)

 

[yuval]

Martin hi,

im using IAR studio. i found the function to transmit - ble_nus_string_send(&m_nus, mydata, dataLength).

i also found the function that receives (app_uart_get(&data_array[index]). i can see the data in p_data but cant find a way to extract it and use the data as a condition for TRUE/FALSE testing. perhaps it is because of the way a BLE message is built. is there a function that searches value within a BLE message ?

[Martin Lesund]

Hi Yk9,

 Please utilize infocenter to search up the functions and the documentation.

The function app_uart_get() is a function for getting a byte from the UART (the UART module), and it is not a part of the Nordic UART Service which is a BLE service.(Do not confuse hardware UART with NUS.)

You can for example use 'strcmp' to compare the string sent over NUS. 

If you are looking for an example that uses "true/false" you can look at the "ble_app_blinky" example which uses the "Led Button Service".

Please read through the theory about BLE in the tutorials to understand how communication over BLE works.