How many no of BLE devices can be paired with other BLE devices simultaneously?
I understand Bluetooth headsets working on BLE4.2> simultaneously allow 2 connections at the same time?
How is it with the BLE?
There are no restrictions in the standard. So it will be implementation specific.
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i want to know the fundamental difference between BLE and Classic Bluetooth and why exactly is BLE low power?
There are quite a few differences between Bluetooth Classic and Bluetooth Low Energy including:
Classic Bluetooth operates on 79 frequency channels, whereas BLE uses only 40.
Classic Bluetooth has a higher throughput than BLE, although the gap is becoming narrower with newer versions of BLE.
A classic Bluetooth device can only be connected to 7 other devices, there is no theoretical maximum to BLE.
The two use different mechanisms for broadcasting/connection. Classic only devices cannot find or connect to BLE only devices and vice versa.
The list goes on beyond the above to the point that it is more common to assume that they are two protocols only sharing a few technical similarities and the same standardisation body (The Bluetooth SIG).
As to what makes BLE low power, this lies in the duty cycle of the protocol. BLE devices sleep for most of the time they are not in operation, and only wake up to send bursts of data and then go back to sleep. Of course this depends on the use case; if an application continuously sends BLE data then there will be fewer sleep intervals and therefore the power consumption will match that of classic Bluetooth.
For more references regarding this question, please see the list below:
4 Key Differences between Classic Bluetooth and BLE
The difference between Classic Bluetooth and BLE
Bluetooth vs Bluetooth Low Energy (BLE)
Bluetooth vs BLE
Can a Bluetooth LE powered device discover a classic Bluetooth device and vice-versa?
I hope this helps.
We have multiple devices (same kind) advertising at the same time. But in iOS, all the advertising packets are treated as one device.
Understand the reason: iOS filtered out the BLE address for privacy reasons.
Without BLE address the advertising packets from the difference devices are exactly the same.
My question is: is it possible to use iOS core bluetooth to tell there are multiple devices are advertising?
Thanks
As stated in the title, can both be ran simultaneously or is a second adapter required? For example, can one adapter run both BLE and BT classic at the same time - the BLE beacon broadcasts the MAC for opportunistic clients to connect to using RFCOMM.
If you are using a common CSR 4.0 Dongle or Ampac AP6212 (which purportedly uses the same Broadcom chip as the RPI3) then this is possible - they are "dual-stack".
Given this, the typical USB CSR chips have a hard limit of two connected RFCOMM clients and the Ampac, 8 or maybe more (tested for sure 8).
Can a Bluetooth device act as a beacon and simultaneously be used for other functions?
I've tried looking around, without finding a concrete answer to this question.
A beacon is a Bluetooth Low Energy device that is advertising. The BLE radio is separate from the classic radio, and since the Bluetooth specification does not restrict the operation of classic Bluetooth along side Low Energy functionality then there is no issue performing classic Bluetooth operation while the device is acting as a Beacon.
I have an android phone and I want it to communicate with 10 bluetooth modules, not simultaneously. I know that a master device can have 7 slaves for bluetooth connection. does it mean "pairing"?
The question is can I have my phone paired with 10 bluetooth devices? Then send them data seperately?
There is no set limit on the number of pairings possible for a device, except for any limitations made by the platform or bluetooth software stack (eg. limited storage).
does it mean "pairing"?
Bluetooth pairing and connecting are two separate operations.
When two Bluetooth devices pair, they will exchange Bluetooth addresses and encryption keys. If pairing is successful, it allows the devices to connect to each other at a later time.
When two bluetooth devices connect, the profiles are established (a2dp if a speaker, hfp if headset, etc), and they can communicate.
Sometimes there is confusion between pairing and connecting since most smartphones automatically connect after detecting a successful pairing.
Pairing is just done once, typically when you buy a Bluetooth product. Connection is done whenever you use the product.
The question is can I have my phone paired with 10 bluetooth devices?
Then send them data seperately?
As mentioned in the other answer, the maximum number of paired devices is platform dependent, it varies from product to product, but there is no set limit. The maximum number of connected devices (that you could send/receive data concurrently to) is 7 according to the Bluetooth specification.