This is the main text in a message attachment, and can contain standard message markup. The content will automatically collapse if it contains 700+ characters or 5+ linebreaks, and will display a "Show more..." link to expand the content. Message may include global variables, for example environment and currentBuild variables:
bearychatSend "Started [${env.JOB_NAME} #${env.BUILD_NUMBER}](${env.BUILD_URL})"