From 313d3a26efa0f673250793a9a1e164d86e0a6425 Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Mon, 21 Oct 2019 21:30:56 +0200
Subject: [PATCH] l2cap-ertm: use Retransmission and Flow Control options for
 ERTM only if supported by remote and channel ready to use it

---
 src/l2cap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/l2cap.c b/src/l2cap.c
index d7447b147..5c3fa8e37 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -1406,8 +1406,8 @@ static int l2cap_ertm_mode(l2cap_channel_t * channel){
 
 static uint16_t l2cap_setup_options_request(l2cap_channel_t * channel, uint8_t * config_options){
 #ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
-    // use ERTM options if supported
-    if (l2cap_ertm_mode(channel)){
+    // use ERTM options if supported by remote and channel ready to use it
+    if (l2cap_ertm_mode(channel) && channel->mode == L2CAP_CHANNEL_MODE_ENHANCED_RETRANSMISSION){
         return l2cap_setup_options_ertm_request(channel, config_options);
     }
 #endif