Posts by Maximilian Batz
First message from picockpit client rendered!
Today, 7.8.2019, at around 18:16 the code is in place for the first message to have been rendered: Thus the Pi “Alexander” is shown as online. Thanks to the magic of vue.js, MQTT, VerneMQ, AdminLTE, Crystal Lang, Python, Paho, AXIOS and much much more! This is the effort of around 320 hours of work…
WeiterlesenGetting POST requests to work with Axios, Kemal (crystal lang), vue.js
In picockpit.com, I am using AJAX requests to communicate with the backend for update operations. For instance, if you want to change the name of this Pi, you would select: which shows an inline form: how to show this inline form with vue.js is besides the point of this post (even though very interesting!) Clicking…
WeiterlesenVerneMQ MQTT connection lost (8): AMQJS0008I Socket closed. different mountpoints
In my setup, I am rewriting the mountpoints of clients from the ones set up by the listeners to individual mountpoints depending on client group. The idea behind this is perfect isolation of multi-tenancy on the server. Individual clients from different groups thus are not able to see each other, even when subscribing to “#”…
WeiterlesenShopify & Langify modify checkout link
Shopify checkout is multilingual The shopify checkout is multilingual: The trick is to have a &locale=en or &locale=en at the end of the link: You can therefore create buttons, etc. which take your user to the checkout, under the links of https://buyzero.de/checkout?locale=de https://buyzero.de/checkout?locale=en which will set the locale to the appropriate language. (replace buyzero.de by…
WeiterlesenBooting Alpine Linux on the Raspberry Pi Compute Module
In our project for a client we are using the Raspberry Pi Compute Module, along with a custom compute module carrier board (called the PCCB – Pi Control Carrier Board) which provides RS485, CAN, RS232, LAN, USB and a step-down for input voltages of 6 – 24 V. (If you are interested in customized hardware…
WeiterlesenDebugging File upload / multipart upload and other HTTP requests
Sometimes you want to see the request as it is received by the server, without any handling / obscuring of the original request. For instance, to see whether different browsers handle file uploads differently. On the other hand, you do not want to write up your own mockup server, just to handle these requests, or…
WeiterlesenLetsTrust TPM SLB 9670VQ2.0 or SLB 9670XQ2.0?
A customer approached us about the difference between SLB 9670VQ2.0 and SLB 9670XQ2.0. VQ has a standard temperature range of (-20 .. +85°C), and XQ is the enhanced temperature range version (-40 .. + 85°C). As the Raspberry Pi itself has a standard temperature range, we use the VQ version on the LetsTrust TPM.
WeiterlesenChanging the mountpoint on auth_on_register webhook for VerneMQ
It is possible to pass modifiers along with the “result”: “ok” return value of your webhook for VerneMQ. The official documentation of VerneMQ gives some examples for the syntax. changing the mountpoint It is also possible to change the mountpoint, however the client_id apparently has to be passed in as well! I have raised an…
WeiterlesenMaximimum length of credentials (username, password, clientid) in MQTT v3.1.1
The CONNECT packet The MQTT CONNECT Control packet always contains a payload. It is the first packet, which the client must send to the server after the connection is established. It can only be sent once by the client, if a second CONNECT packet is sent, the server (broker) must process it as a protocol…
WeiterlesenDebugging VerneMQ connection / authentication problems for dual authentication with webhooks and vmq_diversity
TL;DR https://github.com/vernemq/vernemq/blob/master/apps/vmq_diversity/src/vmq_diversity_plugin.erl includes a statement which will block authentication / authorization through any other channels if your Lua script returns “false”: will lead to: instead of trying other plugins, as you might have assumed! In order to avoid this problem, simply do not return anything from your Lua script, if you do not want to…
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