Read single string register using CGTP

[JTremblayAGT]

There is no method for reading a single string register in the CGTP interface. There is, however, one for writing.

[Rufus31415]

CGTP does not have this feature, the SDK is at the lowest level and implements only the available functions.

use batch reading for reading only one SR : https://underautomation.com/fanuc/documentation/cgtp-registers-variables#batch_variables