diff --git a/src/l2cap.c b/src/l2cap.c
index 16f2c5f7a..74faa29d9 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -2463,9 +2463,26 @@ static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
                     uint16_t control = little_endian_read_16(packet, COMPLETE_L2CAP_HEADER);
                     uint8_t  req_seq = (control >> 8) & 0x3f;
                     if (control & 1){
-                        // int poll = (control >> 7) & 0x01;
-                        log_info("S-Frame not not implemented yet");
                         // S-Frame
+                        // int poll = (control >> 7) & 0x01;
+                        l2cap_supervisory_function_t s = (l2cap_supervisory_function_t) ((control >> 2) & 0x03);
+                        l2cap_ertm_tx_packet_state_t * tx_state;
+                        switch (s){
+                            case L2CAP_SUPERVISORY_FUNCTION_RR_RECEIVER_READY:
+                                tx_state = &l2cap_channel->tx_packets_state[l2cap_channel->tx_read_index];
+                                if ( ((req_seq - 1) & 0x3f) == tx_state->tx_seq){
+                                    log_info("RR seq %u == seq of oldest tx packet -> packet done", req_seq);
+                                    l2cap_channel->tx_read_index++;
+                                    if (l2cap_channel->tx_read_index >= l2cap_channel->num_rx_buffers){
+                                        l2cap_channel->tx_read_index = 0;
+                                    }
+                                } else {
+                                    log_info("RR seq %u != seq of oldest tx packet %u ???", req_seq, tx_state->tx_seq);
+                                }
+                                break;
+                            default:
+                                break;
+                        }
                         break;
                     } else {
                         // I-Frame