User connected Event

index.js

const Client = BandyerChat.create({
	userAlias: 'usr_123456', 
	appId: 'wAppId_fake123456', 
	environment: 'sandbox',
	hidden: false,
	screenSharingExtensionId: 'id of your screen sharing extension'
});

Client.on('user_connected',(user) => {
  if (user.role === 'group_b'){ // your custom logic
    BandyerChat.addChat(user.id)
  }
});