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mqtts protocol? [message #1773176]

Fri, 22 September 2017 18:17

Chuck Williams

Messages: 2
Registered: August 2017

Junior Member

I have the following connection string from one of my development portals:

mqtts://0514da43-afd0-482b-ba9e-ab61772d3fb3:LWdrwd_B52PG4JH0@mqtt.helium.com:28103

I'm trying to use the Sample class in the Java Paho client and I'm getting the following exception:

Exception in thread "main" java.lang.IllegalArgumentException: mqtts://0514da43-afd0-482b-ba9e-ab61772d3fb3:LWdrwd_B52PG4JH0@mqtt.helium.com:28103
at org.eclipse.paho.client.mqttv3.MqttConnectOptions.validateURI(MqttConnectOptions.java:529)
at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:378)
at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:270)
at org.eclipse.paho.client.mqttv3.MqttClient.<init>(MqttClient.java:228)
at com.rfidcollect.iot.Sample.<init>(Sample.java:250)
at com.rfidcollect.iot.Sample.main(Sample.java:177)

I've already modified the sample code to not use tcp: as the protocol. Here are the arguments to the execution of the Sample class:

-a subscribe -t 0514da43-afd0-482b-ba9e-ab61772d3fb3/atom/6081f9fffe000957/rx/# -b mqtts://0514da43-afd0-482b-ba9e-ab61772d3fb3:LWdrwd_B52PG4JH0@mqtt.helium.com -p 28103

Thank you in advance,
Chuck

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Re: mqtts protocol? [message #1773239 is a reply to message #1773176]

Mon, 25 September 2017 09:27

James Sutton

Messages: 71
Registered: July 2015

Member

Hi Chuck,

mqtt or mqtts isn't an official uri scheme (https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml) so that would be unlikely to work.

If you check the code where the exception was thrown, you'll see that only tcp, ws, wss, ssl and local are valid and accepted URI schemes. (https://github.com/eclipse/paho.mqtt.java/blob/master/org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/MqttConnectOptions.java#L526)

I imagine that you've got mqtts instead of mqtt to indicate that it's a secure connection? If that's the case, you'll want to use the ssl uri scheme and use the SSL arguments (v / k / w / r)

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