tcp-establish.patch

diff --git a/include/net/yaip/net_ip.h b/include/net/yaip/net_ip.h
index e131d0b..bc98888 100644
--- a/include/net/yaip/net_ip.h
+++ b/include/net/yaip/net_ip.h
@@ -265,7 +265,10 @@ struct net_udp_hdr {
 struct net_tcp_hdr {
 	uint16_t src_port;
 	uint16_t dst_port;
+	union {
 	uint8_t seq[4];
+	uint32_t seq32;
+	};
 	uint8_t ack[4];
 	uint8_t offset;
 	uint8_t flags;
diff --git a/net/yaip/net_context.c b/net/yaip/net_context.c
index b710726..549d5a3 100644
--- a/net/yaip/net_context.c
+++ b/net/yaip/net_context.c
@@ -897,6 +897,7 @@ static enum net_verdict tcp_syn_rcvd(struct net_conn *conn,
 		struct sockaddr peer, *remote;
 
 		net_tcp_print_recv_info("SYN", buf, NET_TCP_BUF(buf)->src_port);
+		tcp->send_ack = sys_be32_to_cpu(NET_TCP_BUF(buf)->seq32) + 1;
 
 		net_tcp_change_state(tcp, NET_TCP_SYN_RCVD);
 
diff --git a/net/yaip/tcp.c b/net/yaip/tcp.c
index 335f91b..a32df61 100644
--- a/net/yaip/tcp.c
+++ b/net/yaip/tcp.c
@@ -237,6 +237,8 @@ static struct net_buf *prepare_segment(struct net_tcp *tcp,
 	tcphdr->flags = segment->flags;
 	tcphdr->wnd[0] = segment->wnd >> 8;
 	tcphdr->wnd[1] = segment->wnd;
+	tcphdr->urg[0] = 0;
+	tcphdr->urg[1] = 0;
 
 	if (segment->data) {
 		net_buf_frag_add(header, segment->data);