An error occurs on an XR device :invalid command name "::base64::encode"    while executing"::base64::encode [read $fd]"It seems that b64 encoding is not properly declare by default.How could I fix that ?

Hi,We have a core network which is mostly XR.Syntaxical and semantical checks before commits are correctly performed by the system, but I would like to add my own checks to reinforce engineering rules.I am wondering if there is a trick which allow so...