The sending operation is event driven, for example the saving configuration operation on XMS(XenMobile Server) console.
SNMP V3 trap with noAuthNoPriv,this could be verified in the message sent out by XMS
XMS sent SNMP V3 trap with noAuthNoPriv mode.
To use V3 with noAuthNoPriv mode on SNMP manager to receive the traps from XenMobile Server
This article is to summary some detailed information about XMS sending the traps
XenMobile Server SNMP monitoring - https://docs.citrix.com/en-us/xenmobile/server/monitor-support/snmp-monitoring.html