| Re: [hono-dev] Property bag at the end of topics for MQTT adapter? |
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Using the $ sounds reasonable to me even because the MQTT committee is using it for "system topics" in the coming MQTT v5 spec (i.e. $SYS/ ...)
Paolo Patierno
Senior Software Engineer (IoT) @ Red Hat
Microsoft MVP on Windows Embedded & IoT Microsoft Azure Advisor
From: hono-dev-bounces@xxxxxxxxxxx <hono-dev-bounces@xxxxxxxxxxx> on behalf of Pellmann Marc (INST/ECS4) <Marc.Pellmann@xxxxxxxxxxxx>
Sent: Tuesday, February 14, 2017 6:51 AM To: hono developer discussions Subject: Re: [hono-dev] Property bag at the end of topics for MQTT adapter? Hi Kai,
> We should probably declare a delimiter between the endpoint address and the message properties. Similar > to e.g. how it is done in URIs ... > Since we are in control of the endpoint addresses we can make sure that the delimiter is not a part of the > address. In this case we could define "?" as the delimiter. Is there also a delimiter for the properties themselves? > In URIs the "&" character is used for that purpose. Does the "$" have a particular meaning in your example? This is exactly what I had in mind (and also what Azure uses). The typical URI scheme with ? and &. You can see the ? in my example: telemetry/DEFAULT_TENANT/4711/?$content-type=application%2Fjson%3B%20charset%3Dutf-8 At the moment I only use the content-type parameter. If we would have more parameters they would be separated by &. (The $ is the proposed prefix-character by Microsoft for system properties in separation to application properties). Mit freundlichen Grüßen / Best regards Marc Pellmann Bosch Software Innovations GmbH Core Products Development (INST/ECS4) Schöneberger Ufer 89-91 10785 Berlin, Germany www.bosch-si.de Registered office: Berlin, Register court: Amtsgericht Charlottenburg, HRB 148411 B Executives: Dr.-Ing. Rainer Kallenbach, Michael Hahn _______________________________________________ hono-dev mailing list hono-dev@xxxxxxxxxxx To change your delivery options, retrieve your password, or unsubscribe from this list, visit https://dev.eclipse.org/mailman/listinfo/hono-dev |