Those messages are sent by both peering partners (in a later stage both sides act as the same)

Properties

access_group_members: AccessGroupMembersMessage
authentication_token: AuthenticationTokenMessage
encrypted_authentication_token: EncryptedAuthenticationTokenMessage
identity: IdentityMessage
instance_id_object: InstanceIdObjectMessage
keys_object: KeysObjectMessage
person_id_object: PersonIdObjectMessage
person_information: PersonInformationMessage
person_object: PersonObjectMessage
private_person_information: PrivatePersonInformationMessage
start_protocol: StartProtocolMessage