.B version
field indicates what version of the Nano protocol this node is using.

The messageType field indicates what type of message is being relayed, and
must conform to the following enumeration
.TS
allbox tab(:);
cb cb cb cb
c l l l.
messageType:Name:On Bootstrap:On Realtime
0x00:Invalid:Yes:Yes
0x01:Not_A_Type:?:?
0x02:Keepalive:No:Yes
0x03:Publish:No:Yes
0x04:Confirm_Req:No:Yes
0x05:Confirm_Ack:No:Yes
0x06:Bulk_Pull:Yes:No
0x07:Bulk_Push:Yes:No
0x08:Frontier_Req:Yes:No
0x09:Bulk_Pull_Blocks:Yes:No
cb cb cb cb cb
c l l l c.
messageType:Name:On Bootstrap:On Realtime:Version
0x00:Invalid:Yes:Yes:0+
0x01:Not_A_Type:?:?:0+
0x02:Keepalive:No:Yes:0+
0x03:Publish:No:Yes:0+
0x04:Confirm_Req:No:Yes:0+
0x05:Confirm_Ack:No:Yes:0+
0x06:Bulk_Pull:Yes:No:?
0x07:Bulk_Push:Yes:No:?
0x08:Frontier_Req:Yes:No:?
0x09:Bulk_Pull_Blocks:Yes:No:11+
.TE

.B "TODO: Extensions"

Following the message header comes the payload for the particular message
type.