Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: jcottrill on May 17, 2020, 11:30:16 AM

Title: MQTT Authentication
Post by: jcottrill on May 17, 2020, 11:30:16 AM

If I haven't said it already, thank you to the Host Eng team for the JSON and MQTT tools!  I use BRX PLC's for automated testing platforms and these two features alone have simplified my ladder logic and reduced my scan times.

I am wanting to add in some logging and dashboards to my platform.  Since I am already using MQTT, I have been looking into tools like Thingsboard.  I would like to publish results at the end of the test run to the corresponding device I create in Thingsboard.  To do this, you setup an MQTT client and set the username to the devices token.  The password is left empty.

The current implementation of the Do-more MQTT client settings don't allow for an empty password though it is valid in the MQTT spec.  Could the DM MQTT client be updated to support this? 

Title: Re: MQTT Authentication
Post by: BobO on May 18, 2020, 11:51:57 AM

Easy change. Didn't realize that no password was valid.

In the meantime, this is untested, but you may be able to use DEVWRITE to update the password to empty. A quick glance at the code appears to limit max length, but not min, so empty might work.