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    <p>I'll take a stab at this one.</p> <p>1) My understanding of the pairing process is the same. If the data were sensitive enough, I would add an independent layer of encryption of my own in my application...</p> <p>2) For connections, the BLE protocol is limited to one host per device at the same time, even when the connection is not bonded/paired. The only way for a single device to establish a connection to more than one host at the same time is if the device somehow 'pretends' to be multiple devices. Whether or not this can be done will be hardware dependent and it is definitely not one of the standard ways to use a device. Even if you can trick the hardware into doing that, you may run into unavoidable problems such as the occurrence of (nearly) overlapping connection intervals, which may cause you to lose data and eventually even established connections.</p> <p>Another way for a device to communicate with multiple hosts is to regularly disconnect and let another host establish connection. AFAIK, there is no special protocol support for this technique, so beyond perhaps using directed advertising you may not have much control over which host connects next and when it does so.</p> <p>See also Section 4.1.2 in Volume 1, Part A of the 'Core_V4.0' bluetooth spec (e.g. from here <a href="https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=229737" rel="nofollow">https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=229737</a> )</p> <p>3) Most likely yes, the details will vary by vendor, but with the limitations mentioned above.</p> <p>4) You can establish a connection without bonding/pairing. That connection will allow communication, but it will be plaintext without any security. AFAICS, the only way to do this right is to use you own data protection at the application level.</p>
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    1. POBluetooth Low Energy encryption and data safety
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    1. USjelle foks
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    1. COHi @jelle, thanks for your answer. I'm afraid that I've been a little unclear. Only one device will ever be connected at any one time, but the BLE Host should be able to communicate safely with any client, that might want to talk with it. I agree that we will need an additional layer of encryption anyway...
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