How to connect from one Bluetooth to other Bluetooth devices

[chandanaraju]

Hi,

I am using nrf51 dk  with sdk 12.3 and softdevice S130 bluetooth module using Keil IDE.In our project we need to send sensor data from the nrf51 bluetooth module to another bluetooth module which is Tivas's bluetooth module which is in dk board.so here my question is how do i need to connect with this bluetooth module by using bluetooth  address.Bcoz Tivas bluetooth will connect through bluetooth address with different module.

so plz how do i connect through bluetooth address and tell me  which example program do i need to use for this.

[Edvin]

Ok. Based on the information in this ticket so far, you have another BLE device acting as a central which you want to connect to the nRF51, and you want to use this link to send some sensor data.

The peripheral is the device that is advertising, and the central is the device that is scanning for and connecting to a peripheral. So you need to make the nRF advertise (most examples in our SDK does this. Look at the examples in SDK\examples\ble_peripheral. E.g. the ble_app_uart example. 

Then you need to make your central connect to this device, based on some filter in the central. Either address or some part of the advertising message (Advertising name, advertised service uuids, etc.).

I am not familiar with TI's SDK solution, so you would need to ask them.

In addition, if you want to transfer sensor data from the nRF to the central, you need to use a BLE Service and characteristic for this.

I suggest you walk through these three tutorials in this order:

1: https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-advertising-a-beginners-tutorial

2: https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial

3: https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial

[chandanaraju]

Thanks for replying.

In TI's Bluetooth it is connecting through Bluetooth address ,pairing and also check with them .Can you plz tell me how to get the Bluetooth address of the device and sdk example which contain bluetooth address to identify.

[awneil]

It's the Central that needs to get the Address.

The Central is the TI part - so you're going to have to ask TI how to do that on their part!

[awneil]

chandanaraju said:

how to get the Bluetooth address of the device

When the device is advertising, nRF Connect on Android or Desktop shows its MAC address ...

(iOS likes to hide this information).

[Edvin]

You can install Nordic Command Line Tools and use the command:

nrfjprog --memrd 0x100000A4 --n 8

Although a little mixed up, some of those numbers is your adress. The first 4 bytes are the last digits in your address, and the two first bytes in the second chunk is the start of your address.

Please note (marked in yellow) that 0x96 is changed to 0xD6. The reason for this is that the first to bits in this byte has to be 11 in a BLE address. 

EDIT: 

Note that this address is not present in the application, so you will not be able to find it if you search for it. It is a randomly generated number preprogrammed into each nRF.

[awneil]

I think it's easier to just use nRF Connect - or any other BLE scanner ...

The MAC addresses are clearly shown:

[Edvin]

awneil said:

I think it's easier to just use nRF Connect - or any other BLE scanner

 Agree, but if you only had iOS, which hides the address, you can also use nrfjprog.
But if you have an Android phone or an extra DK that you can use together with nRF Connect for Desktop, that is definitely easier.

[chandanaraju]

Thanks .

I will try

[chandanaraju]

..\..\..\main.c(54): error:  #5: cannot open source input file "nordic_common.h": No such file or directory

Why i am getting this type of error?

so, i tried the include the path in option for target tab and selected c/c++ option  in this i have included the 

nordic_common.h path and again i am getting

\..\..\main.c(54): error:  #5: cannot open source input file "ble..h": No such file or directory is coming as error so this error keep on getting as error but with different header file. Can u tell me how to resolve this issue? 

[Edvin]

That depends on your compiler. Did you try to copy the project file to another folder in the SDK? Or outside the SDK?