Hi,
We are getting packets a count mismatch error immediately after first successful bt_iso_chan_send() call, preventing ISO communication that worked in 3.0.2.
This is our settings:
static struct bt_iso_chan_io_qos cen_iso_tx = {
.sdu = 155,
.phy = BT_GAP_LE_PHY_2M,
.rtn = 2,
};
static struct bt_iso_chan_io_qos cen_iso_rx = {
.sdu = 155,
.phy = BT_GAP_LE_PHY_2M,
.rtn = 2,
};
static struct bt_iso_chan_qos iso_qos = {
.tx = &cen_iso_tx,
.rx = &cen_iso_rx,
};
static void iso_connected(struct bt_iso_chan *chan) {
LOG_INF("ISO Channel connected");
k_work_submit(&iso_load_SDU_work); // Send single packet
}
static void iso_sent(struct bt_iso_chan *chan) {
LOG_INF("ISO sent callback");
// No additional sends - just one packet triggers the bug
}
static struct bt_iso_chan_ops iso_ops = {
.connected = iso_connected,
.sent = iso_sent,
};
void iso_load(struct bt_iso_chan *iso_chan, uint16_t seq_num, uint64_t clock) {
uint8_t buf_data[8];
struct net_buf *buf;
memcpy(buf_data, &clock, sizeof(clock));
buf = net_buf_alloc(&tx_pool, K_NO_WAIT);
if (buf != NULL) {
net_buf_reserve(buf, BT_ISO_CHAN_SEND_RESERVE);
net_buf_add_mem(buf, buf_data, sizeof(clock));
int ret = bt_iso_chan_send(iso_chan, buf, seq_num);
if (ret < 0) {
net_buf_unref(buf);
}
// ERROR OCCURS HERE - immediately after successful send
}
}
// CIG creation with standard parameters
struct bt_iso_cig_param param = {
.cis_channels = channels,
.num_cis = 1,
.sca = BT_GAP_SCA_UNKNOWN,
.packing = BT_ISO_PACKING_SEQUENTIAL,
.framing = BT_ISO_FRAMING_UNFRAMED,
.c_to_p_latency = 60,
.p_to_c_latency = 60,
.c_to_p_interval = 10000,
.p_to_c_interval = 10000,
};
This is the CONFIG setting:
CONFIG_BT=y
CONFIG_BT_ISO=y
CONFIG_BT_ISO_CENTRAL=y
CONFIG_BT_ISO_TX_MTU=155
Please let me know if you require further information.
It may be there is something we needed to do in the move from 3.0.2 to 3.1.0
Thanks
James
