Free tool
Send TCP Data Online to Test a GPS Server
This free tool lets you send TCP data online to a public server, as plain text or hex bytes, and shows the server’s reply. Use it to simulate a GPS tracker and confirm your tracking server receives and answers packets.
How to use the send tcp data
- Enter the server address and port.
- Choose Text or Hex and paste the packet, such as a tracker login message.
- Press Send and read the reply in hex and text.
Simulating a GPS tracker without a device
When a new protocol or a new server is being set up, waiting for a real tracker to connect is slow. Sending the tracker’s login packet by hand tells you in seconds whether the server accepts the connection and answers with the right acknowledgement.
Many trackers use binary protocols, which is why hex mode matters. For example, GT06-family devices start every packet with 78 78. Paste the hex bytes from the device manual or a captured log, send them, and compare the reply with what the device expects.
Further reading: Transmission Control Protocol (Wikipedia)
Need this for your whole fleet?
Fleet Scanner decodes 1,000+ device protocols out of the box, so you rarely need to hand-test packets. See our self hosted GPS tracking software.
Send TCP Data FAQs
How much data can I send?
Up to 2 KB per message. The reply is read for up to 5 seconds and the first 4 KB are shown.
Should I send text or hex?
Use text for text-based protocols, which often start with # or $ and end with a line break. Use hex for binary protocols such as GT06, Teltonika and Concox devices.
Why did I get no reply?
Many servers only reply to a valid login packet, and some never reply at all. "Data sent" with no reply still proves the port is open and the packet was delivered.
Are any ports blocked?
Email ports (25, 465, 587 and 2525) and private network addresses are blocked to prevent misuse.