Hi Fernando,
    I haven't personally used the C client within Android - this
      capability was in a contribution:
    https://github.com/eclipse/paho.mqtt.c/pull/299
    Perhaps you could try asking the author of the PR?
    Ian
    
    
    On 23/11/2017 18:38, Fernando . wrote:
    
    
      
        
          
            Hello all,
              
            
            After searching the internet a bit a found there is an
            Android version of Paho MQTT, but it's in Java and i was
            interested in using the C implementation with Android's NDK.
            I already have an ongoing C project in Android Studio and
            wanted to integrate it with the Paho Mqtt C client.
            
          
 
          I noticed there is an "android" folder at github but i'm not
          sure if i'm able to use that makefile with Android Studio: 
          
https://github.com/eclipse/paho.mqtt.c/tree/master/android
          
          
         
        This is fairly new to me, so i'm unsure if there are
          special steps needed to do this. 
          Initially my idea was to add the "add_library" command to the
          default/main "CMakeList.txt" with all the source files to be
          compiled as a shared object (including the headers also), but
          i got a "multiple definitions" error in "MQTTClient.c":
          Error:(1314) multiple definition of
            `MQTTProtocol_closeSession'
            Error:(84) multiple definition of `bstate'
            Error:(80) multiple definition of `client_timestamp_eye'
            Error:(80) multiple definition of `client_version_eye'
        
       
      
      
      
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    -- 
Ian Craggs
icraggs@xxxxxxxxxx                 IBM United Kingdom
Paho Project Lead; Committer on Mosquitto