How do I publish my WiFi.localIP ?

[questuk]

Hi

I have tried googling and tried various things but cannot get this to compile.


 IPAddress ip  (192,168,1,125);   

 WiFi_client.publish (Topic_01, WiFi.localIP); 



It fails with the error:  no matching function for call to 'PubSubClient::publish(const char [15], <unresolved overloaded function type>)'

Any ideas what I am doing wrong ?


Regards

Gaz

[Nicholas O'Leary]

Hi Gaz,

this forum is for the MQTT protocol in general, not specific implementations - you're best pointing questions like this to whoever provides the implementation you're using.

Now, I put my other hat on... whilst you don't state it explicitly, it appears you're using my PubSubClient on Arduino. The problem is the publish() function you're using expects a char[] as the second parameter - you're passing in an IPAddress, and the client doesn't know what to do with it.

A quick google finds some examples of converting IPAddress to char[], for example: https://community.particle.io/t/network-localip-to-string-to-get-it-via-spark-variable/2581/4

Nick

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[questuk]

Hi Nick,

Thanks for helping me, I got there in the end.

Regards


Gaz