July 2019 - pi3g.com

VerneMQ MQTT connection lost (8): AMQJS0008I Socket closed. different mountpoints

By Maximilian Batz | 2019-07-28

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 “#”…

Shopify & Langify modify checkout link

By Maximilian Batz | 2019-07-21

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…

Booting Alpine Linux on the Raspberry Pi Compute Module

By Maximilian Batz | 2019-07-07

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…

Debugging File upload / multipart upload and other HTTP requests

By Maximilian Batz | 2019-07-01

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…