BLE4.0 BLE4.1 和BLE4.2 的主要區別

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 

BLE4.1相比BLE4.0的區別是：

1）與4G網路合并共處，減少幹擾

2）可以同時做主和從，提供速度

3）ipv6

4）簡化了裝置的串連過程

V4.0 到V4.1 硬體不需要改變。

BLE4.1和BLE4.2的區別：

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 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