There is no update from you for a period, assuming this is not an issue any more. Hence we are closing this topic. If need further support, please open a new one. Thanks.
here are the steps to narrow down this issue.
add log in generate_event_msg_meta of deepstream_test5_app_main.c to check if generate_event_msg_meta is called.
nvmsgconv plugin and low-level lib are opensource. you can add log in generate_event_message_minimal to check if the Json data is geneated
you can add log new_gst_nvmsgbroker_render_user_meta_list of gstnvmsgbroker.cpp to check if the sending function nv_msgbroker_send_async is called.
you can us network tool to check if the data is sent and the server can receive the data.