Can you send multiple variables in a single POST with the Ubidots library for Android? What should I modify to achieve it in case it is possible?
Dear @Hever,
By the moment the library just support send one variable in a single post.
To achieve the functionality, please feel free to review the library here. Then, If you desire to contribute with the library, you can simple do it by forking the library and sending us a PR with the changes required in order to add the functionality 
All the best,
Maria C.