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I have configured the mosquitto mqtt broker on a raspberry pi via this link

I have the ca.crt,client.crt and client.key. How do I use them in android? It would be really nice if someone could help me out here

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    This is really a specific programming question more than a generic IoT question. I would suggest you ask this sort of thing on Stack Overflow (and please do not cross post questions between the 2)
    – hardillb
    May 18, 2018 at 12:06
  • There are manyMQTT clients for Android out on the Google Play Store....you just need to find one that will let you install the certs and use them :)
    – JD Allen
    May 18, 2018 at 13:38
  • Rather than using self-signed certificates for which you need to tell your client to trust them: use something that your Android client might trust out of the box. Using Let's Encrypt gives you free certificates that are trusted by modern software. (But note that if a browser on your Android device trusts this, it might still not be trusted by Android itself, or some MQTT client running on that device.) See, for example, pimylifeup.com/raspberry-pi-ssl-lets-encrypt
    – Arjan
    May 18, 2018 at 17:39
  • It'll depend on the app, but with Owntracks you set the certificates in the security section of the connection preferences
    – Aaron F
    May 23, 2018 at 19:06

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I have found the answer to this and it can be achieved by creating a .pem file which includes the client.crt and client.key.

Then we can create a .bks using portecle which should contain client.pem, ca.crt and server.crt and then we create a socketfactory with the bks and add that socketfactory to client.

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