I've found chinese clone devices from Ebay with IMEI beginning with 8686830....... and 35971004.... work fine as a "Xexun TK-102" . These are known to work.
After configured with SMS and connected, these devices accept further configuration commands sent via TCP/IP using the orange.gps-trace.com control panel. These are of course able to be automated in conjunction with geofences etc. Example commands:
Report every one minute:
Report every 10 minutes:
( replace the $$$$$ with your tracker's unique ID )
When buying from Ebay ensure the first digits of IMEI really is as shown in the seller's photo description. Some sellers use generic tracker photos.