Can't get MQTT to work on DeepStream 7.1

Accelerated Computing Intelligent Video Analytics DeepStream SDK
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1

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
Jetson Orin Nano 8GB
• DeepStream Version
7.1
• JetPack Version (valid for Jetson only)
6.1
• TensorRT Version
10.3
• Issue Type

Error: gst-library-error-quark: Could not initialize supporting library. (3): /dvs/git/dirty/git-master_linux/deepstream/sdk/src/gst-plugins/gst-nvmsgbroker/gstnvmsgbroker.cpp(401): legacy_gst_nvmsgbroker_start (): /GstPipeline:pipeline0/GstNvMsgBroker:nvmsg-broker:
unable to open shared library

• How to reproduce the issue ?

After a fresh install of JetPack 6.1 with DeepStream 7.1, I simply followed all the instructions to run the deepstream-test4 with mqtt. I installed the required dependencies, (both in the README.md in that folder, and the ones in /opt/nvidia/deepstream/deepstream-7.1/sources/libs/mqtt_protocol_adaptor/README.md)

Then I lunched the file with

python3 deepstream_test_4.py -i "/home/concept/example.mp4" -p "/opt/nvidia/deepstream/deepstream-7.1/lib/libnvds_mqtt_proto.so" --conn-str="broker.hivemq.com;1883" --topic="/jackaldetection/detections"

The output is what I mentioned earlier. I found a similar issue here, but installing the mentioned dependencies didn’t work for me

3

can you find in libnvds_mqtt_proto.so in /opt/nvidia/deepstream/deepstream/lib/libnvds_mqtt_proto.so? if so, can you share the result of “ldd /opt/nvidia/deepstream/deepstream/lib/libnvds_mqtt_proto.so”?

4

Thanks for the answer!

Yes, the proto lib exists:

concept@ubuntu:/opt/nvidia/deepstream/deepstream-7.1/sources/deepstream_python_apps/apps/deepstream-test4$ ls /opt/nvidia/deepstream/deepstream/lib/libnvds_mqtt_proto.so
/opt/nvidia/deepstream/deepstream/lib/libnvds_mqtt_proto.so

And here’s the requested output

concept@ubuntu:/opt/nvidia/deepstream/deepstream-7.1/sources/deepstream_python_apps/apps/deepstream-test4$ ldd /opt/nvidia/deepstream/deepstream/lib/libnvds_mqtt_proto.so
	linux-vdso.so.1 (0x0000ffffbed34000)
	libglib-2.0.so.0 => /lib/aarch64-linux-gnu/libglib-2.0.so.0 (0x0000ffffbeb60000)
	libmosquitto.so.1 => /usr/local/lib/libmosquitto.so.1 (0x0000ffffbeb30000)
	libcrypto.so.3 => /lib/aarch64-linux-gnu/libcrypto.so.3 (0x0000ffffbe740000)
	libnvds_logger.so => /opt/nvidia/deepstream/deepstream-7.1/lib/libnvds_logger.so (0x0000ffffbe720000)
	libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffffbe4f0000)
	libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffffbe340000)
	/lib/ld-linux-aarch64.so.1 (0x0000ffffbecfb000)
	libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffffbe310000)
	libpcre.so.3 => /lib/aarch64-linux-gnu/libpcre.so.3 (0x0000ffffbe290000)
	libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffffbe1f0000)
5

In DS7.1, nvmsgbroker plugin and low-level lib are openosurce. from the error “unable to open shared library”, it is because dlopen libnvds_mqtt_proto.so failed. you can find the code in legacy_gst_nvmsgbroker_start of opt\nvidia\deepstream\deepstream-7.1\sources\gst-plugins\gst-nvmsgbroker\gstnvmsgbroker.cpp. but from the ldd result, seems the dependency has be installed.
I suggest using the test tool of low-level lib to narrow down this issue. the path is /opt/nvidia/deepstream/deepstream/sources/libs/mqtt_protocol_adaptor. please refer to the README under the path. especially modify test_mqtt_proto_async.cpp to use your conn-str and topics.

1 Like
6

Sorry for the late reply, Is this still an DeepStream issue to support? Thanks!

7

No it’s not, thank you for your kind answer! Keep up the good work

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