large-scale deployments. But, it is too expensive to setup large numbers
of your MQTT sensors to test your IoT back-office platform, including
MQTT broker and client applications.
With MIMIC MQTT Simulator, it is simple to create large sensor simulations
(you can run up to 100,000 simulated sensors on a single server)
to verify performance. The methodology is to use MIMIC to simulate a
large environment with synthetic background throughput, then verify
your performance requirements (eg. maximum round-trip delay) either
with a small number of your real-world sensor, or with another MIMIC
setup measuring end-to-end latency. That way you are sure the synthetic
load is not impacting your measurement setup except through the broker.
measuring instrumentation, and the end-to-end delay is graphed in the
bottom graph. It shows minimum, average and maximum delay for messages
from those sensors to a subscriber running in the same MIMIC.
From another MIMIC instance, we keep adding a synthetic load onto the
MQTT broker under test, from 0 to 1000 in steps of 100. The upper graph
shows the size of the background load over the 15 minutes of the test.
Each background load sensor publishes at 1 message per second, so the
throughput is the same as the number of sensors. This is trivial to
change in MIMIC to conform to your real-world expectations.
As you can see, the delay is only slightly increasing over time, except
for 2 notable bumps at 600 and 1000 sensors. It is trivial to repeat the
scenario, and verify that indeed there is a reproduceable problem. You
would never know if you did not do the tests.