From 4d84ed183ee477cba3ff3bc3d7b4cbebe73fa5c9 Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Sun, 16 Aug 2020 21:23:01 -0500
Subject: [PATCH] Adhere better to P/F bit procedure for I frames

---
 src/server.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/server.c b/src/server.c
index 1639395..e8b0918 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1528,6 +1528,15 @@ static int handle_i(patty_ax25_server *server,
     patty_timer_start(&sock->timer_t2, PATTY_AX25_SOCK_DEFAULT_DELAY);
     patty_timer_start(&sock->timer_t3, PATTY_AX25_SOCK_DEFAULT_KEEPALIVE);
 
+    /*
+     * AX.25 v2.2 Section 6.2 "Poll/Final (P/F) Bit Procedures"
+     */
+    if (frame->pf == 1) {
+        return FD_ISSET(sock->fd, &server->fds_watch)?
+            patty_ax25_sock_send_rr(sock, PATTY_AX25_FRAME_RESPONSE, 1):
+            patty_ax25_sock_send_rnr(sock, PATTY_AX25_FRAME_RESPONSE, 1);
+    }
+
     return 0;
 
 error_handle_segment: