swarm: remove unused/dead code (#18351)

swarm/network/protocol.go

@@ -35,8 +35,6 @@ import (
 
 const (
 	DefaultNetworkID = 3
-	// ProtocolMaxMsgSize maximum allowed message size
-	ProtocolMaxMsgSize = 10 * 1024 * 1024
 	// timeout for waiting
 	bzzHandshakeTimeout = 3000 * time.Millisecond
 )
@@ -250,11 +248,6 @@ func NewBzzPeer(p *protocols.Peer) *BzzPeer {
 	return &BzzPeer{Peer: p, BzzAddr: NewAddr(p.Node())}
 }
 
-// LastActive returns the time the peer was last active
-func (p *BzzPeer) LastActive() time.Time {
-	return p.lastActive
-}
-
 // ID returns the peer's underlay node identifier.
 func (p *BzzPeer) ID() enode.ID {
 	// This is here to resolve a method tie: both protocols.Peer and BzzAddr are embedded