Debugging MQTT over websockets on Envoy 1.28.0

By Maximilian Batz | 2023-11-12

I have migrated our Envoy installation from Envoy 1.11.1 to 1.28.0, and am now also using SNI for selecting the correct certificate. A big part of that migration is upgrading the syntax of the configuration for Envoy from the v2 API to the v3 API. The upgrade went well, except for our websocket-based MQTT service…

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envoy, docker and websockets – debugging and configuration

By Maximilian Batz | 2019-05-18

Websockets are an exciting technology, allowing you to upgrade a HTTP connection to a long-running persistent binary connection, which you can use to send bi-directional messages. As an aside, the MQTT protocol can be transported using websockets – which is the only (?) way for a JavaScript client delivered by the website, for instance. In…

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Install Crystal on Docker: how to add the Crystal repository to Docker in the Dockerfile

By Maximilian Batz | 2019-01-11

Dockerfile (excerpt) ENV APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=DontWarn RUN apt-get update && apt-get install -y \          software-properties-common \          build-essential \         libevent-dev \         libssl-dev \         libxml2-dev \         libyaml-dev \         libgmp-dev \         libreadline-dev \         apt-transport-https \         iputils-ping \         git \         aptitude \         nano \         openssh-server \         && apt-key adv –keyserver keys.gnupg.net –recv-keys 09617FD37CC06B54 \         && add-apt-repository ‘deb https://dist.crystal-lang.org/apt crystal…

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