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SENTRY
Hardware User Manual
SENTRY is a stand-alone cellular network analyser that passively observes the cellular
environment that it is placed in and sends the observed data back to a cloud-based
management portal (CloudSURVEY) where this can be viewed and analysed. As well
as passively observing the cellular environment, the SENTRY may optionally execute
performance tests on the cellular network to which it is registered to measure such
parameters as connection time, latency, and data transfer rates.
The SENTRY uses an embedded STM32F405 Arm® Cortex® M4 core processor
combined with a cellular modem to perform the measurements and tests that the
user demands on the cellular environment. Additionally, a GNSS receiver identies the
location at which each cellular survey is conducted. After performing the network tests,
the SENTRY then automatically uploads the test results and positional data to the
CloudSURVEY Portal using an encrypted link. Cellular network test results may then be
reviewed on the CloudSURVEY portal.
CloudSURVEY (https://www.cloud-survey.co.uk) is the user interface to SENTRY after
rst time use conguration using the SirettaSPARK PC based device management tool. It
is from CloudSURVEY that cellular surveys are started, stopped, paused and congured.
Cellular surveys may be programmed to run continuously, or at set intervals, with optional
overall surveying time limits. Survey results are presented both textually so that the detail
may be seen, and graphically so that there is an overall view of what is happening.
All surveys will at least identify all the cells found, the network operator, signal strength,
frequency of operation and the location of the discovered cells overlaid on a map.
Performance monitoring surveys additionally show cellular, TCP/IP and Socket registration
times, uplink/downlink speeds, ping times, and comparative data with other cells of the
same network.
In areas where there is poor and/or intermittent cellular coverage, it is possible to congure
the SENTRY to output its measurements on an RS232 serial port rather than post data to
the CloudSURVEY portal.
Introduction
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