Added SoC callback feature, fixed socket re-opening error

[ArendJanKramer]

Sorry about formatting here and there, I couldn't prevent PyCharm from fixing some style.

Features:

• Support a callback to post SoC states, which are extracted from some responses
• Fix issue with re-opening socket

[ArendJanKramer]

@uhi22 If you want me to make changes, or perhaps work something out in more extend, no problem just let me know in the review.