Maven publication of multi-modules android library

I am working on an Android SDK made of multiple library modules and a test app module:

mySDK
|-test-app
|-lib-core
|-lib-ui
|-...

I would like to publish it on a Maven repository, with all library modules embedded (but not the test-app).

I know how to publish a single library module using Maven Publish Plugin but can't figure out how to make a Maven publication containing multiple library modules.

How would you do that ?

Just upload each module as a standalone module.
It is not mandatory to upload all the modules at the same time, the dependencies are just described in the pom file.

It can be useful putting a base script in a single gradle file with some common settings and properties (you can read them from a gradle.properties file), something like:

rootFolder/maven_push.gradle:

apply plugin: 'maven'
//....

      pom.artifactId = POM_ARTIFACT_ID

      pom.project {
           name POM_NAME
           packaging POM_PACKAGING
           description POM_DESCRIPTION
           url POM_URL
           //...
      }

      //...

and then in each module/build.gradle file add:

apply from: '../maven_push.gradle'