MQTT bridge unable to connect to broker with SSL - Stack Overflow

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I'm trying to connect Mosquitto bridge to the broker with SSL. I've prepared configuration basing on these:

/

/

When I disable SSL (remove certs from configs and change the port) it works fine. Furthermore, test app that I wrote in nodeJS with mqtt library connects to the broker over SSL without any problems (using the same ca.crt as bridge). So it looks like there is something wrong in the bridge but don't know what and logs don't help.

MQTT broker config:

allow_anonymous true
listener 8883
protocol mqtt
cafile /mosquitto/certs/ca.crt
certfile /mosquitto/certs/server.crt
keyfile /mosquitto/certs/server.key

MQTT bridge config:

log_type all

allow_anonymous true
listener 1883 0.0.0.0

connection hub_to_cloud
address XXX.XXX.XX.XX:8884
bridge_cafile /mosquitto/certs/ca.crt
bridge_protocol_version mqttv311
try_private false
topic # both 0

docker-compose.yml:

version: "3.8"

services:
  nginx:
    image: nginx:alpine
    restart: always
    container_name: nginx-container
    ports:
      - 80:80
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf
      - ./nginx/logs:/var/log/nginx
    networks:
      - mqtt-net
    depends_on:
      - mosquitto
  mosquitto:
    image: eclipse-mosquitto:2
    container_name: mqtt-broker
    ports:
      - 1884:1883
      - 8884:8883
      - 9002:9001
    volumes:
      - ./mosquitto/config:/mosquitto/config
      - ./mosquitto/data:/mosquitto/data
      - ./mosquitto/log:/mosquitto/log
      - ./mosquitto/certs:/mosquitto/certs
    networks:
      - mqtt-net
networks:
  mqtt-net:

nginx.conf:

events {
  worker_connections 1024;
}

stream {
  error_log /var/log/nginx/error.log;

  upstream mqtt_broker {
    server mqtt-broker:8884;
  }

  server {
    listen 8884;
    proxy_pass mqtt_broker;
  }
}

And the only result from the bridge is:

Connecting bridge hub_to_cloud (XXX.XXX.XX.XX:8884)

I'm trying to connect Mosquitto bridge to the broker with SSL. I've prepared configuration basing on these:

http://www.steves-internet-guide/mosquitto-tls/

http://www.steves-internet-guide/mosquitto-bridge-encryption/

When I disable SSL (remove certs from configs and change the port) it works fine. Furthermore, test app that I wrote in nodeJS with mqtt library connects to the broker over SSL without any problems (using the same ca.crt as bridge). So it looks like there is something wrong in the bridge but don't know what and logs don't help.

MQTT broker config:

allow_anonymous true
listener 8883
protocol mqtt
cafile /mosquitto/certs/ca.crt
certfile /mosquitto/certs/server.crt
keyfile /mosquitto/certs/server.key

MQTT bridge config:

log_type all

allow_anonymous true
listener 1883 0.0.0.0

connection hub_to_cloud
address XXX.XXX.XX.XX:8884
bridge_cafile /mosquitto/certs/ca.crt
bridge_protocol_version mqttv311
try_private false
topic # both 0

docker-compose.yml:

version: "3.8"

services:
  nginx:
    image: nginx:alpine
    restart: always
    container_name: nginx-container
    ports:
      - 80:80
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf
      - ./nginx/logs:/var/log/nginx
    networks:
      - mqtt-net
    depends_on:
      - mosquitto
  mosquitto:
    image: eclipse-mosquitto:2
    container_name: mqtt-broker
    ports:
      - 1884:1883
      - 8884:8883
      - 9002:9001
    volumes:
      - ./mosquitto/config:/mosquitto/config
      - ./mosquitto/data:/mosquitto/data
      - ./mosquitto/log:/mosquitto/log
      - ./mosquitto/certs:/mosquitto/certs
    networks:
      - mqtt-net
networks:
  mqtt-net:

nginx.conf:

events {
  worker_connections 1024;
}

stream {
  error_log /var/log/nginx/error.log;

  upstream mqtt_broker {
    server mqtt-broker:8884;
  }

  server {
    listen 8884;
    proxy_pass mqtt_broker;
  }
}

And the only result from the bridge is:

Connecting bridge hub_to_cloud (XXX.XXX.XX.XX:8884)

• ssl
• mqtt
• mosquitto

Share Improve this question Follow asked Mar 7 at 16:03 PawełPaweł 4111 gold badge11 silver badge44 bronze badges 1

• What is the relevance of nginx here? (the mosquitto container is bound to host port 8884 so it would appear that the conenction would direct, and not via nginx?). "remove certs from configs and change the port" - why change the port? (please test over port 8884 without TLS). Is anything logged in the central broker log? – Brits Commented Mar 7 at 20:49

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1 Answer 1

Sorted by: Reset to default 0

Ok, I managed to resolve the problem. When I changed the image version to

eclipse-mosquitto:latest

it started to work fine. In this image there is mosquitto version 2.0.21, while in

eclipse-mosquitto:2

mosquitto is in version 2.0.18 and it doesn't work.

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