Add a listener for IOException

如果在读取串口数据的过程中，设备断线了，线程会抛出IOException。此时应当关闭串口输入，再尝试重新打开

Allow user to set read delay

2.1.0

Merge pull request #1 from evision-ai/feat/set-read-delay-when-initia…

Fix an input stream null pointer issue

2.0.6

fix a null pointer crash issue