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GOTOP - VT-350 Protocol

This page describes the public protocol context for using the GOTOP VT-350 OBD GPS tracker with the Plaspy platform. It summarizes how the VT-350 commonly reports position and status information over cellular data, what role the tracker protocol plays in that reporting, and how Plaspy accepts and routes those reports for fleet monitoring.

The VT-350 is an OBD II form factor tracker with built in GSM and GPS antennas that can report location and status via GPRS or respond to SMS on command. Plaspy uses shared connection settings across supported devices and automatically detects the tracker protocol, but exact protocol behavior can vary with firmware version, hardware revision, and manufacturer implementation. Consult manufacturer documentation for firmware specific details when needed.

Protocol Overview​

At a high level, the tracker reporting protocol defines the way VT-350 encodes and transmits location, movement, and diagnostic data so a server like Plaspy can receive and interpret it. The protocol is the bridge between the device's GPS/GSM hardware and the platform that displays positions, alerts, and telemetry.

  • Enables the VT-350 to deliver periodic or on demand location reports to a remote server.
  • Conveys identifying information so Plaspy can associate incoming data with the correct device record.
  • Carries telemetry fields such as latitude, longitude, speed, direction, odometer, and alert flags that Plaspy turns into map positions and events.
  • Supports different reporting triggers used by the device such as time interval, distance, movement, or SMS command.
  • Allows the tracker to send event notifications like overspeed, geofence breaches, movement alerts, and power cut alarms.
  • Works over cellular data to make real time tracking available to fleet and vehicle monitoring systems.

How Plaspy Detects the Protocol​

Plaspy accepts incoming device connections on a single shared endpoint and port and is designed to automatically detect the tracker protocol when a properly configured device reports in. In most cases, a VT-350 that is pointed to the Plaspy endpoint will be detected automatically without requiring manual protocol selection inside the platform.

  • Plaspy server domain for device reporting is d.plaspy.com.
  • The public Plaspy server IP address is 54.85.159.138.
  • Plaspy listens on port 8888 for tracker reports and device configuration.
  • Devices may be configured to use either UDP or TCP on port 8888 depending on the tracker firmware and settings.
  • All devices supported by Plaspy use the same port, which simplifies device setup.
  • If the VT-350 is configured to report to the Plaspy endpoint, the platform will attempt to identify the incoming protocol and process reports automatically.

Transport and Connection Context​

The VT-350 can use the cellular network to transmit its reports. Connection transport and addressing are configuration items on the device that determine how the tracker reaches Plaspy over the internet. Awareness of these transport options helps ensure the device can reach the platform reliably.

  • The VT-350 may be configured to report via UDP or TCP depending on device capability and chosen settings.
  • When using GPRS data reporting, point the tracker to d.plaspy.com or to the Plaspy server IP at 54.85.159.138.
  • Plaspy receives tracker traffic on port 8888; this is the standard port used for all devices on the platform.
  • Network conditions, SIM data plan limits, and APN configuration on the device impact successful connections.
  • Firewalls and NAT on intermediate networks should allow outbound UDP or TCP to d.plaspy.com on port 8888 for reliable reporting.

Protocol Compatibility Notes​

  • Firmware differences between VT-350 units can change which protocol features are available or the exact behavior of event reporting.
  • Hardware revisions or regional variants may use slightly different default transport settings or reporting triggers.
  • Manufacturer configuration commands and SMS controls can affect whether the device reports by interval, distance, or GSM base station location.
  • Selecting UDP versus TCP may affect delivery characteristics; choose the transport that matches your device firmware recommendation.
  • Always validate that the device is configured to report to d.plaspy.com or 54.85.159.138 on port 8888 to ensure Plaspy receives data.
  • For any advanced or firmware specific behaviors, refer to the official GOTOP documentation to confirm compatibility.

Why Protocol Understanding Matters​

Understanding how the VT-350 communicates with a server helps with setup, monitoring, and troubleshooting. Clear knowledge of the reporting transport and expected fields reduces setup time and improves operational reliability when devices are deployed at scale.

  • Ensures correct device configuration so reports reach Plaspy reliably.
  • Helps diagnose connectivity issues by confirming transport, endpoint, and APN settings.
  • Allows correct interpretation of alerts and telemetry fields that the tracker sends.
  • Guides decisions about reporting interval, battery and power alarm handling, and event filtering.
  • Reduces time to resolution when troubleshooting missing positions or inconsistent telemetry.

Why Use Plaspy with This Protocol​

Using Plaspy with the GOTOP VT-350 provides a straightforward way to convert the tracker’s GPS and GSM reports into actionable fleet data. Organizations gain vehicle visibility, alerting for overspeed and geofence events, and aggregated telemetry such as mileage and movement history without managing per-device ports or endpoints.

Plaspy’s single endpoint architecture and automatic protocol detection simplify deployment: point the VT-350 to d.plaspy.com or 54.85.159.138 and ensure the device uses port 8888 over UDP or TCP. This shared configuration approach reduces setup complexity across a mixed fleet of devices.

To learn more about Plaspy and how it can receive and process reports from devices like the GOTOP VT-350, visit https://www.plaspy.com. Please verify the latest protocol specifics, firmware behavior, and implementation details with the device manufacturer at https://www.gotop.cc/ since protocol support and firmware features can change over time.

Tracker Communication

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