l2ping Bluetooth connection maximum links

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I have a question regarding the max concurrent connections using bluetooth dongles. My system is based on 10 Raspberry Pi-es 2 and what I am trying to accomplish is to make a bluetooth low energy connection between them for some research project. My bluetooth dongles are: Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode). When I set up Raspberries for the bluetooth mode (Bluez, etc.) everything works fine and every raspberry can scan other raspberries (hcitool scan), but when I try ping other raspberries from one of them I only succeed to get response from 7 devices, where the rest of the devices report "Error: connect error: Too many links". I am wondering is this hardware related limitations or technology limitations, since I've read in a few articles that Bluetooth when making a piconet supports only 8 devices. Thanks in advance.

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