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iStartek - VT900-L Protocol

This page documents the public protocol context for using the iStartek VT900-L tracker with Plaspy. It summarizes how the device communicates with Plaspy in operational terms, the shared connection settings Plaspy uses, and practical considerations for integration and troubleshooting without exposing sensitive or proprietary implementation details.

Plaspy uses shared connection settings across supported devices and automatically detects the tracker protocol when the device reports to the Plaspy endpoint. Exact behavior of the VT900-L can vary by firmware version, hardware revision, and manufacturer configuration. The VT900-L supports multi channel reporting including TCP, UDP and SMS and uses local logging to preserve records during coverage gaps.

Protocol Overview​

The VT900-L reporting protocol is the on device mechanism that delivers GNSS, sensor, and event data from the tracker to a backend platform such as Plaspy. In practice this means the tracker encodes telemetry and alarm events and transmits them over the network or via SMS so Plaspy can ingest, interpret, and surface the data for fleet workflows.

  • Enables real time delivery of GNSS position, speed, heading and telemetry to Plaspy
  • Supports multiple transports for resilience including TCP UDP and SMS as a fallback
  • Provides event and alarm reporting to capture geofence breaches, power events and other alerts
  • Uses local logging on the device to store records during cellular outage and upload when connection returns
  • Works with vehicle sensors and interfaces such as analog inputs 1 Wire and RS232 to include auxiliary telemetry in reports

How Plaspy Detects the Protocol​

Plaspy receives incoming traffic on a common endpoint and port and uses the information in the incoming messages to select the appropriate handling for the tracker. For most VT900-L deployments you do not need to pick a protocol inside Plaspy if the tracker is configured to report to the Plaspy endpoint.

  • Plaspy server domain for device reporting is d.plaspy.com
  • Plaspy server public IP is 54.85.159.138 and the service listens on port 8888
  • Devices may be configured to use UDP or TCP on port 8888 depending on device settings
  • All devices in Plaspy use the same port which simplifies device configuration
  • Plaspy automatically detects the tracker protocol when data is received at the endpoint

Transport and Connection Context​

Transport selection and endpoint configuration determine how the VT900-L reaches Plaspy across cellular networks. The VT900-L can be set to report over the network using TCP or UDP on the shared Plaspy port, and SMS can be used for fallback reporting or specific remote command flows depending on how the device is provisioned.

  • VT900-L devices may point to d.plaspy.com or directly to 54.85.159.138 for reporting
  • TCP and UDP are both supported transports and can be used on port 8888
  • SMS reporting is available as an alternate channel when configured on the device
  • Local flash logging on the VT900-L preserves records for later upload when connectivity is restored
  • Choose the transport that matches your regional network stability and device configuration

Protocol Compatibility Notes​

  • The VT900-L is compatible with Plaspy but behavior may vary with firmware releases and hardware variants
  • Transport mode selection TCP versus UDP can affect latency and reliability depending on network conditions
  • Manufacturer configuration and provisioning options may change which reporting features are available
  • Regional cellular module variants can influence available bands and connection behavior
  • Validate device settings against current manufacturer documentation before large scale deployment
  • Plaspy will accept data on its shared port and detect protocol automatically when the device is correctly configured

Why Protocol Understanding Matters​

Understanding the VT900-L communication protocol helps ensure reliable reporting, faster troubleshooting, and smoother device lifecycle management when integrated with Plaspy. Clear knowledge of transport, endpoint settings and device logging behavior reduces setup time and operational surprises.

  • Speeds initial provisioning by matching device host and transport to Plaspy settings
  • Simplifies troubleshooting when connectivity or reporting gaps occur
  • Helps decide when to use TCP UDP or SMS based on network behavior
  • Informs firmware upgrade planning to maintain or improve protocol compatibility
  • Supports better integration of auxiliary sensors and external interfaces into reporting workflows

Why Use Plaspy with This Protocol​

Using the VT900-L with Plaspy gives fleet operators a practical path to real time tracking, telemetry consolidation and event driven workflows. The device hardware and multi channel reporting align with Plaspy s shared endpoint approach so location, alarms and sensor data arrive at a single platform for visualization, alerts and reporting.

To learn more about Plaspy visit https://www.plaspy.com. For the most current device and firmware specific protocol details verify information with the manufacturer at https://istartek.com/ as protocol support and firmware behavior can change over time.

Tracker Communication

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