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Connecting one CC2640 peripheral to several central devices

Mattias Haeger
Prodigy 125 points
Other Parts Discussed in Thread: CC2640

As I understand it is not possible for a peripheral device to be connected to several central devices simutaneously, is that correct?
We use a CC2640 in our products and when I look in bleUserConfig.h it is possible to set MAX_NUM_BLE_CONNS to oter value than 1.
According to comment the recommended value for peripherals is one but it only says "recommended" which makes me a bit unsure.

Our use case is that the peripheral device advertises acoording to a strict profile description.
Advertising data and scan response are included in the profile definition and can't be changed.
The central device is a mobile phone app.
New thing now is that several other "type B" central devices shall be able to connect to the peripheral device.
Type 2 central devices use another profile to connect to another type of peripheral and we probably need to advertise as two different peripheral devices interchangeably.

Anyone that has experience of a similar use case?
And if there are, how did you solve it?

BR
Mattias Haeger

  • 0
    TI__Guru** 105180 points

    Hello Mattias,


    BT Core spec v4.1 allows exactly this configuration. Please see the MultiRole demo on the TI SimpleLink GitHub page for an active sample application. A link is provided on the TI BLE wiki.

    Best wishes

  • 0 in reply to JXS
    Prodigy 125 points

    Thanks for the answer.
    I tried to run the example on our own hardware and succeded to connect my peripheral device to two different central devices.
    It is possible to change a characteristic value from one central device and read the new value with the other central device, so far so good.
    In our real product we however use the CC2640 as a network processor based on the TI host test example.
    Do you see any problems to run an NWP in a multirole configuration, RAM constraints or anythig else? Or have you tested that already?

    I also wonder if is possible to switch between two different advertiseing messages and scan responses a few times (2-10) per second?
    This would make it possible for the peripheral device to look like two different devices from the cental devices view which would facilitate things a lot.

    BR

    Mattias