Do we have the list for the supported characters or not allowed characters for RFS?

Our partner wants to know the list below

1) User ID & Password for RFS and Onboard Radius

2) Radius Shared secret

3) ESSID

Regarding to AP-5131, I could find out the list which is invalid for ESSID.

Please let me know if we have the description in the user guide.

Your clarification would be greatly appreciated.