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EElink - GPT46 Protocol

This page provides a public protocol context for using the EElink GPT46 GPS tracker with Plaspy. It describes how the tracker commonly communicates location and telemetry to a Plaspy endpoint, what connection settings are used in general, and what to consider when integrating the GPT46 into a Plaspy deployment. The information here is intended for technical teams planning integration, deployment, or troubleshooting.

The GPT46 is a long standby LTE Cat M1 and NB1 IoT tracker with BLE host functionality, optimized for logistics and movable asset monitoring. Plaspy uses shared connection settings across supported devices and automatically detects the tracker protocol, but exact behavior can vary by firmware version, hardware revision, and manufacturer implementation. In practice the device is typically configured to report to the Plaspy endpoint and rely on the tracker reporting protocol supported by the device firmware.

Protocol Overview​

The tracker communication protocol defines how the GPT46 sends position fixes, telemetry, and sensor context to a cloud endpoint so Plaspy can ingest and display usable data. The role of the protocol is primarily to ensure timely location reporting, device identification, and delivery of complementary telemetry such as battery state and BLE sensor inputs.

  • Enables the GPT46 to send GNSS based location fixes and telemetry to a remote server for mapping and history.
  • Carries device identity and status so Plaspy can associate incoming data with the correct asset record.
  • Transmits BLE host data and auxiliary sensor readings that enrich location reports with temperature, proximity, or other context.
  • Supports periodic check ins and movement reports to balance real time visibility with long standby battery life.
  • Provides the transportable payload that Plaspy translates into dashboards, alerts, and reporting for operations teams.

How Plaspy Detects the Protocol​

Plaspy receives incoming device traffic on a single shared endpoint and automatically identifies the tracker protocol the device is using. When a GPT46 is pointed at the Plaspy endpoint, Plaspy will typically detect the message format and map the information into the platform without requiring manual protocol selection.

  • Plaspy uses a single public endpoint reachable at d.plaspy.com and an associated server address of 54.85.159.138.
  • All devices in Plaspy use the same port, which simplifies device configuration and onboarding.
  • The GPT46 may be configured to report to Plaspy over UDP or TCP on port 8888 depending on device settings and carrier behavior.
  • In most cases you do not need to manually select a protocol inside Plaspy if the device is configured to report to the Plaspy endpoint.
  • Proper device configuration and correct reporting host and port are the typical prerequisites for automatic detection to succeed.

Transport and Connection Context​

Transport describes how the tracker establishes a connection to the Plaspy endpoint and over which path the protocol messages travel. For the GPT46 this generally means cellular uplink to the Plaspy server using a single consistent port for all supported devices.

  • The GPT46 can be configured to use UDP or TCP transport on port 8888 depending on firmware capabilities and deployment needs.
  • Devices can be pointed to the Plaspy host by using d.plaspy.com or the server IP 54.85.159.138 in device configuration.
  • Because Plaspy uses the same port for all devices, network firewall and APN settings can be simplified across a fleet.
  • Cellular network factors such as APN configuration, SIM provisioning, and carrier roaming rules can affect connectivity to the Plaspy endpoint.
  • Ensure firewall rules permit outbound UDP and TCP traffic to the Plaspy server address and port used in your deployment.

Protocol Compatibility Notes​

  • Firmware revisions may change what telemetry fields are reported or how frequently reports are sent; validate behavior against your device firmware.
  • Hardware revisions or regional variants of the GPT46 can introduce differences in available bands, BLE features, or power management.
  • The choice of UDP versus TCP transport may affect reliability and battery consumption depending on carrier and signal quality.
  • BLE host and external sensor support depends on the device firmware and the specific BLE peripherals used in your deployment.
  • Always verify configuration parameters for the reporting host and port before large scale rollouts to avoid misdirected traffic.
  • When in doubt, test a sample device against Plaspy in a staging environment to confirm expected behavior.

Why Protocol Understanding Matters​

Understanding the communication protocol used by the GPT46 helps teams ensure reliable reporting, diagnose connectivity issues, and optimize device settings for battery life and reporting granularity. Clear protocol knowledge reduces integration time and improves operational confidence.

  • Helps pinpoint whether an issue is network, transport, or device configuration related.
  • Guides decisions on transport selection and reporting intervals to balance visibility and battery life.
  • Enables better planning for BLE sensor integration and expected telemetry fields.
  • Reduces onboarding friction by clarifying which device settings must point to the Plaspy endpoint.
  • Supports troubleshooting with manufacturer or carrier teams by providing a focused context for logs and behavior.

Why Use Plaspy with This Protocol​

Using the GPT46 with Plaspy gives organizations centralized visibility over long standby assets while supporting BLE sensor augmentation for richer telemetry. The combination of LTE Cat M1 connectivity, BLE host capability, and Plaspy's unified ingestion endpoint helps fleets and logistics teams turn device reports into actionable workflows, alerts, and historical analysis.

To learn more about how Plaspy handles device integrations and to review platform capabilities, visit https://www.plaspy.com. For the latest GPT46 protocol specifics, firmware notes, and manufacturer guidance confirm details on the EElink site at https://www.eelink.com.cn/. Protocol support and device firmware behavior can change over time, so verifying device specific documentation with the manufacturer is recommended.

Tracker Communication

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