The main differences between BLE4.0 BLE4.1 and BLE4.2

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

Http://sina.com.hk/news/article/20131223/0/5/0/-38766.html?cf=o.digital

The difference between BLE4.1 compared to BLE4.0 is:

1 with 4G network integration, reduce interference

2 can simultaneously master and from, provide speed

3) IPv6

4 simplifies the connection process of the device

V4.0 to V4.1 hardware does not need to change.

The difference between BLE4.1 and BLE4.2:

http://www.semiconductorstore.com/blog/2015/BLE-4-2-vs-BLE-4-1/1548

Key bluetooth 4.2 Features not Available with Bluetooth 4.1 IoT capabilities:low-power IP (ipv6/6lowpan) Bluetooth Smar   T 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 the location and confidently pair. speed:250% Faster 10x More Capacity