The SIG creates two kinds of device at 4.0 including Bluetooth Smart Ready and Smart.
Smart Ready is used at most platform such as smart phone or laptop, could support traditional Bluetooth and Bluetooth 4.0 both.
Bluetooth Smart is only Bluetooth 4.0 device and could not connect with traditional Bluetooth device.
Bluetooth 4.0, its name Bluetooth low energy, means remove some hardware and software capability and redesign the system for low energy device compared to traditional Bluetooth.
Bluetooth 4.1 vs Bluetooth 4.0?
The job of Bluetooth 4.1 is to drive the ‘Internet of Things’ (Io, namely the thousands of smart, web connected devices – from fridges to toothbrushes – that are expected to enter our lives over the next decade.
1. Coexistence
Bluetooth 4.1 eliminates this by coordinating its radio with 4G automatically so there is no overlap and both can perform at their maximum potential. It's about phone Bluetooth spec.
2. Smart connectivity
Rather than carry a fixed timeout period, Bluetooth 4.1 will allow manufacturers to specify the reconnection timeout intervals for their devices. This means devices can better manage their power and that of the device they are paired to by automatically powering up and down based on a bespoke power plan.
3. Improved Data Transfer
Bluetooth 4.1 devices can act as both hub and end point simultaneously. This is hugely significant because it allows the host device to be cut out of the equation and for peripherals to communicate independently.
Bluetooth 4.2, what's new?
Why use BLE 4.2 instead of BLE 4.1? The Bluetooth SIG recommends implementing Bluetooth 4.2 in all new designs and requires the same qualification process as all other Bluetooth designs. Devices using Bluetooth Smart will be backward compatible with Bluetooth 4.0 or 4.1 devices that also implement the low energy features. Devices implementing the (BR/EDR) Core Configuration will be backward compatible to all adopted Bluetooth Core versions beginning with 1.1 that also implement Bluetooth BR/EDR.
It means the upgrade may not just F/W upgrade, hardware may also need to change.
Chris Carini,
Views
Using a device that has a newer version would not work unless it is backwards compatible; for instance, if a device you are trying to connect was using Bluetooth 4.2 and needed Data Length Extension (it may, not entirely sure) then it would not work with the iPhone because that is hardware not software limited [2].
IoT Capabilities:
Low-power IP (IPv6/6LoWPAN)
Bluetooth Smart Internet Gateways (GATT)
With BLE 4.2 Bluetooth Smart sensors can transmit data over the internet.
Security:
LE Privacy 1.2
LE Secure Connections
With new, more power efficient and highly secure features, BLE 4.2 provides additional benefits allowing only trusted owners to track device location and confidently pair devices.
Speed:
250% Faster
10x More Capacity
Compared to previous versions, BLE 4.2 enables 250% faster and more reliable over-the-air data transmission and 10x more packet capacity.
Apple support BLE 4.2 news.
http://www.phonearena.com/news/Did-you-know-Apple-has-added-Bluetooth-4.2-to-iPhone-6-iPhone-6-Plus-and-iPad-Air-2_id74601
iPhone 6 series most support Bluetooth 4.2
http://www.apple.com/iphone/compare/
Reference:
1. (from https://www.quora.com/What-are-the-main-differences-between-Bluetooth-4-0-4-1-and-4-2-in-the-Layers-Baseband-LMP-L2CAP-app-Layer)
2. SIG Bluetooth Q&A
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