Hi, I'm programming a MCAP library for Bluez, (it is in beta state yet). I need add support for ERTM and Streaming mode to L2CAP sockets and i've seen some work included in l2cap kernel module by Gustavo F. Padovan. I have downloaded the kernel source from git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-2.6.git <http://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-2.6.git> and compiled it enabling ERTM module parameter to test my current implementation of MCAP profile. I would like to know which is the current state of ERTM and Streaming mode in l2cap and if you are planning to continue the development task in above mentioned retransmission modes. My tests using ERTM results in kernel oops messages when i try to send/receive a buffer data. I tested Streaming mode too but it does not do anything when data is sent over L2CAP sockets. In [1] i adjunct the kernel oops message when ERTM is used. Is it possible that i'm doing something wrong?. Next is the code that i'm using to set ERTM and Streaming mode in l2cap: static int set_sock_options (int sock, uint16_t imtu, uint16_t omtu, uint8_t mode) { struct l2cap_options opts; int err; socklen_t optlen = sizeof(opts); err = getsockopt( sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, &optlen ); if (!err) { opts.omtu = omtu; opts.imtu = imtu; opts.mode = mode; MCAP_DBG("Mode %d, fcs %d", opts.mode, opts.fcs); err = setsockopt( sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, optlen ); } return err; } i'm using L2CAP_MODE_ERTM and L2CAP_MODE_STREAMING macros to set the l2cap option mode field. Best regards [1] http://www.kerneloops.org/submitresult.php?number=858407 <http://www.kerneloops.org/submitresult.php?number=858407> Next is the output that i got before kernel error is shown: HCI sniffer - Bluetooth packet analyzer ver 1.42 device: hci0 snap_len: 1028 filter: 0xffffffff > HCI Event: Connect Request (0x04) plen 10 bdaddr 00:0A:94:02:CE:87 class 0x4a0100 type ACL < HCI Command: Accept Connection Request (0x01|0x0009) plen 7 bdaddr 00:0A:94:02:CE:87 role 0x00 Role: Master > HCI Event: Command Status (0x0f) plen 4 Accept Connection Request (0x01|0x0009) status 0x00 ncmd 1 > HCI Event: Role Change (0x12) plen 8 status 0x00 bdaddr 00:0A:94:02:CE:87 role 0x00 Role: Master > HCI Event: Connect Complete (0x03) plen 11 status 0x00 handle 46 bdaddr 00:0A:94:02:CE:87 type ACL encrypt 0x00 < HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2 handle 46 > HCI Event: Page Scan Repetition Mode Change (0x20) plen 7 bdaddr 00:0A:94:02:CE:87 mode 1 > HCI Event: Command Status (0x0f) plen 4 Read Remote Supported Features (0x01|0x001b) status 0x00 ncmd 0 > HCI Event: Max Slots Change (0x1b) plen 3 handle 46 slots 5 > HCI Event: Command Status (0x0f) plen 4 Unknown (0x00|0x0000) status 0x00 ncmd 1 < HCI Command: Remote Name Request (0x01|0x0019) plen 10 bdaddr 00:0A:94:02:CE:87 mode 2 clkoffset 0x0000 > HCI Event: Read Remote Supported Features (0x0b) plen 11 status 0x00 handle 46 Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80 > HCI Event: Command Status (0x0f) plen 4 Remote Name Request (0x01|0x0019) status 0x00 ncmd 1 > ACL data: handle 46 flags 0x02 dlen 10 L2CAP(s): Info req: type 2 < ACL data: handle 46 flags 0x02 dlen 16 L2CAP(s): Info rsp: type 2 result 0 Extended feature mask 0x00b8 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > ACL data: handle 46 flags 0x02 dlen 10 L2CAP(s): Info req: type 3 < ACL data: handle 46 flags 0x02 dlen 20 L2CAP(s): Info rsp: type 3 result 0 Unknown (len 8) > ACL data: handle 46 flags 0x02 dlen 12 L2CAP(s): Connect req: psm 4097 scid 0x0040 < ACL data: handle 46 flags 0x02 dlen 16 L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 1 status 0 Connection pending - No futher information available < ACL data: handle 46 flags 0x02 dlen 10 L2CAP(s): Info req: type 2 > HCI Event: Remote Name Req Complete (0x07) plen 255 status 0x00 bdaddr 00:0A:94:02:CE:87 name 'blueztester-0' > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > ACL data: handle 46 flags 0x02 dlen 16 L2CAP(s): Info rsp: type 2 result 0 Extended feature mask 0x00b8 < ACL data: handle 46 flags 0x02 dlen 10 L2CAP(s): Info req: type 3 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > ACL data: handle 46 flags 0x02 dlen 20 L2CAP(s): Info rsp: type 3 result 0 Unknown (len 8) < ACL data: handle 46 flags 0x02 dlen 16 L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 0 status 0 Connection successful > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > ACL data: handle 46 flags 0x02 dlen 23 L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 11 RFC 0x03 (Reserved) < ACL data: handle 46 flags 0x02 dlen 29 L2CAP(s): Config rsp: scid 0x0040 flags 0x00 result 0 clen 15 MTU 672 RFC 0x03 (Reserved) < ACL data: handle 46 flags 0x02 dlen 23 L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 11 RFC 0x03 (Reserved) > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 46 packets 1 > ACL data: handle 46 flags 0x02 dlen 29 L2CAP(s): Config rsp: scid 0x0040 flags 0x00 result 0 clen 15 MTU 672 RFC 0x03 (Reserved) > ACL data: handle 46 flags 0x02 dlen 13 L2CAP(d): cid 0x0040 len 9 ctrl 0x0000 fcs 0x33e3 [psm 4097] I-frame: Unsegmented TxSeq 0 ReqSeq 0 0000: 01 01 00 01 01 ..... < ACL data: handle 46 flags 0x02 dlen 13 L2CAP(d): cid 0x0040 len 9 ctrl 0x0000 fcs 0x9ff6 [psm 4097] I-frame: Unsegmented TxSeq 0 ReqSeq 0 0000: 02 00 01 00 01 ..... 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