Implements a visca protocal module to control PTZ camera through serial port

eLandon eef938ed5f added methods %!s(int64=4) %!d(string=hai) anos
Visca.js eef938ed5f added methods %!s(int64=4) %!d(string=hai) anos
module.json eef938ed5f added methods %!s(int64=4) %!d(string=hai) anos