1 files changed, 17 insertions, 0 deletions
diff --git a/internal/net/conn.go b/internal/net/conn.go
index 6d78d8f..a7c53ec 100644
--- a/internal/net/conn.go
+++ b/internal/net/conn.go
@@ -92,6 +92,23 @@ func (t *tcpConn) SetEcho(on bool) error {
 	return t.writeTelnetCmd(will, echo)
 }
 
+// EchoSequence returns the telnet negotiation bytes that switch the client's
+// echo state. Queued sessions transmit these through the session writer so a
+// stalled client cannot block the caller (see Session.SetEcho); the local
+// echo state is applied separately via SetEchoState.
+func (t *tcpConn) EchoSequence(on bool) []byte {
+	if on {
+		return []byte{iac, wont, echo}
+	}
+	return []byte{iac, will, echo}
+}
+
+// SetEchoState records the echo state without writing to the network; used
+// when the negotiation bytes are queued instead of written inline.
+func (t *tcpConn) SetEchoState(on bool) {
+	t.echoOff = !on
+}
+
 const (
 	iac  = 255
 	will = 251