RTC Checkout code in groovy

Hello Team

I am working on groovy script where i need to Checkout(or download)  the component  from RTC .

Anyone have idea how do we solve this?

I have a sample code which is not working .

checkout([$class: 'RTCScm',
    avoidUsingToolkit: false, buildTool: 'current',
    buildType: [buildDefinition: 'ESM_CC-AS_ALM_Tooling_Dev',    
                value: 'buildDefinition'],
                credentialsId: buildUser,
                overrideGlobal: true,
                serverURI: 'https://rb-alm-06-p-si-01.de.bosch.com/ccm/',           //write the alm link
                timeout: 480])

please help