Apparatus is configured: to generate a sequence of at least first and second messages; to provide the first message in the sequence with sequence data and payload data, the sequence data of the first message indicating that the payload data of the first message is a first part of a sequence of related data; and to provide the second message in the sequence with sequence data and payload data, the sequence data of the second message indicating that the payload data of the second message is a part of the sequence of related data, the part of the sequence of related data being subsequent to the first part of the sequence of related data.