About GP Reader
The GP Reader app connects an Android phone or tablet to RIOT's BTDL Bluetooth SDI-12 Data Logger, for example to log GroPoint in-ground soil moisture multi-segment profile sensors. Connect to the BTDL unit to configure...
The GP Reader app connects an Android phone or tablet to RIOT's BTDL Bluetooth SDI-12 Data Logger, for example to log GroPoint in-ground soil moisture multi-segment profile sensors. Connect to the BTDL unit to configure measurements, download data, or display realtime soil moisture and temperature data on the screen.
Requires Bluetooth 4.0 (BLE) wireless connectivity hardware
GP Reader helps farmers, park and golf course managers to precisely monitor soil moisture at several levels of root depth. This allows for the most efficient irrigation and water conservation possible.
The Gro-Point Reader app works with RIOT's in-ground SDI-12 soil moisture profile sensors connected to the BTDL unit.
Previous Versions
Here you can find the changelog of GP Reader since it was posted on our website on 2019-11-06 18:28:04.
The latest version is and it was updated on 2026-06-11 20:12:14. See below the changes in each version.
GP Reader version 1.1.22
Updated At: 2025-06-27
Changes: * Firmware-Over-The-Air (FOTA) update support for GP-BTDL Loggers (Logger firmware V3.3 and later).
* Data parsing algorithm improvement: misconfigured measurement commands no longer halt parsing of valid sensor measurements.
* Target SDK: 34 (Android 14)
* Minimum SDK: 27 (Android 8.1)
GP Reader version 1.1.20
Updated At: 2023-12-06
Changes: (1) Updates target API level to 33 (Android 13).
GP Reader version 1.1.18
Updated At: 2022-07-12
Changes: (1) Added BTDL low battery warning messages/indications.
(2) Fixed a bug that BLE does not disconnect properly for some Android devices.
(3) OTS is used for data download (prerequisite: BTDL V31+, Android 10+).
(4) A new file sharing module added
(5) Target Android version incremented to 31.
(6) Minor UI improvements
GP Reader version 1.1.17
Updated At: 2021-07-15
Changes: Corrects data parsing for newer design GroPoint sensors that use the M2! command for additional temperature sensor measurements. Better parsing support for all versions of GroPoint sensor firmware.
Other UI improvements and bug fixes.
GP Reader version 1.1.16
Updated At: 2020-12-17
Changes: Restricts downloaded data display in the app to a few hundred lines
Support for new feature: variable sample rates (switches to once daily at a user set low temperature)
Other UI improvements and bug fixes
GP Reader version 1.1.14
Updated At: 2020-08-17
Changes: Improved Bluetooth Connect dialog for Android 10 devices.
Refinements to data download for older logger firmware versions (now retains backup files).
Other UI improvements and bug fixes.
GP Reader version 1.1.13
Updated At: 2020-08-08
Changes: Added measure and parsing support for new design RIOT profiling sensors (more temperature sensors).
Restored correct operation and data parsing of older V1.2 and V1.3 logger firmware.
Improved Connect dialog responsiveness for Android 8 and higher (loggers were very slow to show up).
Other UI improvements and bug fixes.
GP Reader version 1.1.12
Updated At: 2020-01-28
Changes: Changed the BLT scanning code to support newer methods introduced after Android API level 21. This corrected a scanning issue with Android 10 devices. Fixed a bug affecting older Android 5 devices. Other minor bug fixes and improvements.
GP Reader version 1.1.11
Updated At: 2019-12-16
Changes: Improvements to display of measurement data (values have meaningful labels, such as Seg.1, Temp.1 etc.).
Temperature data is displayed with selected units (°C or °F).
Fixes to parsing routine that was causing application crashes under certain conditions.
Timeouts implemented for long operations (erase memory).
GP Reader version 1.1.10
Updated At: 2019-12-02
Changes: Added support for regional decimal separator character (e.g. '.' or ',').
Added support for selecting different data separator characters (tab, comma, semicolon).
Disclaimer
Official Google Play Link
We do not host GP Reader on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Google and passed their terms and conditions to be listed there. We recommend caution when installing it.
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