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Connection procedure not working #3

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grrrr opened this issue Jan 20, 2024 · 1 comment
Open

Connection procedure not working #3

grrrr opened this issue Jan 20, 2024 · 1 comment

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@grrrr
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grrrr commented Jan 20, 2024

Currently, the connection through a ATDECC controller of a talker to a listener is not working. It does not respond with a CONNECT_TX_COMMAND.

From analyzing working commercial endpoints, the process seems is the following:

  • Controller to IEEE1722 Multicast: AVDECC Connection Management Protocol CONNECT_RX_COMMAND
  • Listener to IEEE1722 Multicast: AVDECC Connection Management Protocol CONNECT_RX_RESPONSE
  • Listener to IEEE1722 Multicast: AVDECC Connection Management Protocol CONNECT_TX_COMMAND
  • Talker to IEEE1722 Multicast: AVDECC Connection Management Protocol CONNECT_TX_RESPONSE

This is also described in Section 8.1.1 in the IEEE 17221-2021 document (although a little cryptic, because of exception cases):

  • The ATDECC Controller sends a CONNECT_RX_COMMAND to the ATDECC Listener.
  • The ATDECC Listener sends a CONNECT_TX_COMMAND to the ATDECC Talker.
  • The ATDECC Talker responds with an appropriate STATUS and the connection information.
  • In case of a timeout of the first CONNECT_TX_COMMAND, the ATDECC Listener sends a single retry to the ATDECC Talker. If this command fails then the ATDECC Listener returns failure for the CONNECT_RX_COMMAND.

The successful sequence captured through tshark looks like this:

Frame 140: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface enp7s0, id 0
    Section number: 1
    Interface id: 0 (enp7s0)
        Interface name: enp7s0
    Encapsulation type: Ethernet (1)
    Arrival Time: Jan 20, 2024 13:53:43.214685558 CET
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1705755223.214685558 seconds
    [Time delta from previous captured frame: 0.019706947 seconds]
    [Time delta from previous displayed frame: 0.588755977 seconds]
    [Time since reference or first frame: 4.080592344 seconds]
    Frame Number: 140
    Frame Length: 70 bytes (560 bits)
    Capture Length: 70 bytes (560 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ieee1722:ieee17221]
Ethernet II, Src: IntelCor_ec:a0:e5 (00:1b:21:ec:a0:e5), Dst: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
    Destination: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        Address: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: IntelCor_ec:a0:e5 (00:1b:21:ec:a0:e5)
        Address: IntelCor_ec:a0:e5 (00:1b:21:ec:a0:e5)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IEEE 1722 Audio Video Transport Protocol (0x22f0)
IEEE 1722 Audio Video Transport Protocol (AVTP)
    AVTP Subtype: AVDECC Connection Management Protocol (0xfc)
    0... .... = AVTP Stream ID Valid: False
    .000 .... = AVTP Version: 0x0
IEEE 1722.1 Protocol
    .... 0110 = Message Type: CONNECT_RX_COMMAND (6)
    0000 0... = Status Field: SUCCESS (0)
    .... .000 0010 1100 = Control Data Length: 44
    Stream ID: 0x0000000000000000
    Controller GUID: 0x001b21eca0e50083
    Talker GUID: 0x020000fffe000019
    Listener GUID: 0x480bb2fffed08169
    Talker Unique ID: 0x0001
    Listener Unique ID: 0x0000
    Destination MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Connection Count: 0
    Sequence ID: 0x001c
    Flags: 0x0000
        .... .... .... ...0 = CLASS_B: False
        .... .... .... ..0. = FAST_CONNECT: False
        .... .... .... .0.. = SAVED_STATE: False
        .... .... .... 0... = STREAMING_WAIT: False
        .... .... ...0 .... = SUPPORTS_ENCRYPTED: False
        .... .... ..0. .... = ENCRYPTED_PDU: False
        .... .... .0.. .... = TALKER_FAILED: False
    Stream VLAN Id: 0x0000

Frame 141: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface enp7s0, id 0
    Section number: 1
    Interface id: 0 (enp7s0)
        Interface name: enp7s0
    Encapsulation type: Ethernet (1)
    Arrival Time: Jan 20, 2024 13:53:43.219645441 CET
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1705755223.219645441 seconds
    [Time delta from previous captured frame: 0.004959883 seconds]
    [Time delta from previous displayed frame: 0.004959883 seconds]
    [Time since reference or first frame: 4.085552227 seconds]
    Frame Number: 141
    Frame Length: 70 bytes (560 bits)
    Capture Length: 70 bytes (560 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ieee1722:ieee17221]
Ethernet II, Src: M2Lab_81:69 (48:0b:b2:d0:81:69), Dst: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
    Destination: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        Address: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: M2Lab_81:69 (48:0b:b2:d0:81:69)
        Address: M2Lab_81:69 (48:0b:b2:d0:81:69)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IEEE 1722 Audio Video Transport Protocol (0x22f0)
IEEE 1722 Audio Video Transport Protocol (AVTP)
    AVTP Subtype: AVDECC Connection Management Protocol (0xfc)
    0... .... = AVTP Stream ID Valid: False
    .000 .... = AVTP Version: 0x0
IEEE 1722.1 Protocol
    .... 0111 = Message Type: CONNECT_RX_RESPONSE (7)
    0000 0... = Status Field: SUCCESS (0)
    .... .000 0010 1100 = Control Data Length: 44
    Stream ID: 0x0000000000000000
    Controller GUID: 0x001b21eca0e50083
    Talker GUID: 0x020000fffe000019
    Listener GUID: 0x480bb2fffed08169
    Talker Unique ID: 0x0001
    Listener Unique ID: 0x0000
    Destination MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Connection Count: 1
    Sequence ID: 0x001c
    Flags: 0x0000
        .... .... .... ...0 = CLASS_B: False
        .... .... .... ..0. = FAST_CONNECT: False
        .... .... .... .0.. = SAVED_STATE: False
        .... .... .... 0... = STREAMING_WAIT: False
        .... .... ...0 .... = SUPPORTS_ENCRYPTED: False
        .... .... ..0. .... = ENCRYPTED_PDU: False
        .... .... .0.. .... = TALKER_FAILED: False
    Stream VLAN Id: 0x0000

Frame 142: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface enp7s0, id 0
    Section number: 1
    Interface id: 0 (enp7s0)
        Interface name: enp7s0
    Encapsulation type: Ethernet (1)
    Arrival Time: Jan 20, 2024 13:53:43.219733066 CET
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1705755223.219733066 seconds
    [Time delta from previous captured frame: 0.000087625 seconds]
    [Time delta from previous displayed frame: 0.000087625 seconds]
    [Time since reference or first frame: 4.085639852 seconds]
    Frame Number: 142
    Frame Length: 70 bytes (560 bits)
    Capture Length: 70 bytes (560 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ieee1722:ieee17221]
Ethernet II, Src: M2Lab_81:69 (48:0b:b2:d0:81:69), Dst: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
    Destination: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        Address: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: M2Lab_81:69 (48:0b:b2:d0:81:69)
        Address: M2Lab_81:69 (48:0b:b2:d0:81:69)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IEEE 1722 Audio Video Transport Protocol (0x22f0)
IEEE 1722 Audio Video Transport Protocol (AVTP)
    AVTP Subtype: AVDECC Connection Management Protocol (0xfc)
    0... .... = AVTP Stream ID Valid: False
    .000 .... = AVTP Version: 0x0
IEEE 1722.1 Protocol
    .... 0000 = Message Type: CONNECT_TX_COMMAND (0)
    0000 0... = Status Field: SUCCESS (0)
    .... .000 0010 1100 = Control Data Length: 44
    Stream ID: 0x0000000000000000
    Controller GUID: 0x001b21eca0e50083
    Talker GUID: 0x020000fffe000019
    Listener GUID: 0x480bb2fffed08169
    Talker Unique ID: 0x0001
    Listener Unique ID: 0x0000
    Destination MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Connection Count: 0
    Sequence ID: 0x0009
    Flags: 0x0002
        .... .... .... ...0 = CLASS_B: False
        .... .... .... ..1. = FAST_CONNECT: True
        .... .... .... .0.. = SAVED_STATE: False
        .... .... .... 0... = STREAMING_WAIT: False
        .... .... ...0 .... = SUPPORTS_ENCRYPTED: False
        .... .... ..0. .... = ENCRYPTED_PDU: False
        .... .... .0.. .... = TALKER_FAILED: False
    Stream VLAN Id: 0x0000

Frame 143: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface enp7s0, id 0
    Section number: 1
    Interface id: 0 (enp7s0)
        Interface name: enp7s0
    Encapsulation type: Ethernet (1)
    Arrival Time: Jan 20, 2024 13:53:43.219889507 CET
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1705755223.219889507 seconds
    [Time delta from previous captured frame: 0.000156441 seconds]
    [Time delta from previous displayed frame: 0.000156441 seconds]
    [Time since reference or first frame: 4.085796293 seconds]
    Frame Number: 143
    Frame Length: 70 bytes (560 bits)
    Capture Length: 70 bytes (560 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ieee1722:ieee17221]
Ethernet II, Src: 02:00:00:00:00:19 (02:00:00:00:00:19), Dst: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
    Destination: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        Address: IEEE1722_01:00:00 (91:e0:f0:01:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: 02:00:00:00:00:19 (02:00:00:00:00:19)
        Address: 02:00:00:00:00:19 (02:00:00:00:00:19)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IEEE 1722 Audio Video Transport Protocol (0x22f0)
IEEE 1722 Audio Video Transport Protocol (AVTP)
    AVTP Subtype: AVDECC Connection Management Protocol (0xfc)
    0... .... = AVTP Stream ID Valid: False
    .000 .... = AVTP Version: 0x0
IEEE 1722.1 Protocol
    .... 0001 = Message Type: CONNECT_TX_RESPONSE (1)
    0000 0... = Status Field: SUCCESS (0)
    .... .000 0010 1100 = Control Data Length: 44
    Stream ID: 0x0200000000190001
    Controller GUID: 0x001b21eca0e50083
    Talker GUID: 0x020000fffe000019
    Listener GUID: 0x480bb2fffed08169
    Talker Unique ID: 0x0001
    Listener Unique ID: 0x0000
    Destination MAC address: IEEE1722_00:86:de (91:e0:f0:00:86:de)
    Connection Count: 1
    Sequence ID: 0x0009
    Flags: 0x0002
        .... .... .... ...0 = CLASS_B: False
        .... .... .... ..1. = FAST_CONNECT: True
        .... .... .... .0.. = SAVED_STATE: False
        .... .... .... 0... = STREAMING_WAIT: False
        .... .... ...0 .... = SUPPORTS_ENCRYPTED: False
        .... .... ..0. .... = ENCRYPTED_PDU: False
        .... .... .0.. .... = TALKER_FAILED: False
    Stream VLAN Id: 0x0002
@grrrr
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grrrr commented Jan 20, 2024

The problem is that the listener_unique_id checked in the _handleConnectRxCommand and other methods is not correctly set/handled, so that the validListenerUnique function returns false.

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@grrrr