BLE Peripheral Inter-device Communications

[joer55]

Hi:

I believe this is possible but will ask anyway.  I am working on a device that connects to a BLE central device (a cell phone).  I would also like to send advertising information (MAC address) to a peripheral device that is also connected to a central device.   Is it possible to have one BLE peripheral device advertise and another peripheral device scan while both are connected to central devices?  Is there a limit on the size of data that can be sent during the advertisement?

Thanks,
Joe55

[awneil]

By definition, only a Central does the scanning.

However, an nRF52 device can implement both Central & Peripheral functions in the same device.

Also, in general, a Peripheral stops advertising once connected - but an nRF52 could be programmed to continue advertising when connected.

devzone.nordicsemi.com/.../269806

joer55 said:

Is there a limit on the size of data that can be sent during the advertisement

Yes

devzone.nordicsemi.com/.../ble-advertising-a-beginners-tutorial

[joer55]

Hi Again:

Thanks for the response.  My peripheral device is now able to advertise to another peripheral while connected to a central.  I am also able to scan for the advertisement with the other peripheral which is also connected to a different central.  I am trying to implement an identifier in the advertisement message (like "x1000") so the scanner will recognize it, but unable to get this working.  Any suggestions for this?  Also, is there a way to have a flag included in the advertisement (something that would change for each advertisement made)?

Thanks,

Joe55

[awneil]

Have you looked at the Manufacturer-Specific Data ?

[joer55]

Thanks Awneil: 

That was exactly what I needed. Much appreciated.

Joe55