Concept2 CSAFE Communication Definition document can be downloaded without the SDK

[MoralCode]

The README links to the SDK as the source of the documents cited

PyRow/README.md

Line 13 in 69dd5ad

- [Concept2 PM Communication Interface Definition](http://www.concept2.com/service/software/software-development-kit)

However, it seems to now be available at this link, which, to my knowledge, is a new document that combines the concept2 CSAFE spec and the bluetooth interface spec into one document.