Get Tracker Position

• user
• pwd (md5 hash of the password)
• token (optional, can be used instead of user and password to access group trackers
• deviceSn = serial number of the Tracker, user must be the owner of the tracker.
• grpid = all trackers of the group, user must be the owner of the group.
• rb = filter only this report back class (4-Retrieve canceled,5-Need Retrieve,6-SOS,7-SOS canceled)