Vector support

[ben-auo]

Vector is a popular open source observability platform and supports MQTT but when it tries to connect to Emitter it throws ERROR vector::internal_events::mqtt: MQTT connection error. error=I/O: connection closed by peer error_code="mqtt_connection_error" error_type="writer_failed" stage="sending" internal_log_rate_limit=true

Thoughts?

[ben-auo]

Further testing shows it works with non-TLS MQTT. I'll see if there's a limitation with MQTTS. Where does Emitter store the cert for testing with https://vector.dev/docs/reference/configuration/sinks/mqtt/#tls ?

[ben-auo]

Never mind, I didn't install OpenSSL since "Vector implements cryptography and secure communication using the OpenSSL library. In particular, the official Vector binaries are statically linked against OpenSSL version 3.3.2 and do not use any OpenSSL library installed on the running system." [source] but by not having it installed my system didn't have the trusted certificate paths configured so Vector didn't have the Let's Encrypt cert loaded. Installing OpenSSL solved the issue.

[ben-auo]

After a reboot it fails to connect. Will investigate further. Since Vector uses https://github.com/bytebeamio/rumqtt under the hood, I'll start there.

Ref: #388

[ben-auo]

ref vectordotdev/vector#21374

[ben-auo]

Findings summary: vectordotdev/vector#21374 (comment)

Since the request to upgrade Emitter to MQTT protocol 5 was marked wontfix, I'll close this request as well and recommend others avoid Emitter as legacy software.