Hi all,
I would like to know the details about controlling openocd via TCP/IP
(port 6666). I have been experimenting with it, and I hope I'm doing
something wrong, because it does not seem to work.
I can connect to the openocd server, but any "command word" such as
"reset" or "halt", sent has no effect. By studying the loopback network
TCP/IP activity with Wireshark, I was able to see that the openocd
server returns one ACK message after each command sent by the client,
but no data (length=0).
The openocd version I used was compiled from today's git sources.
For issuing TCP/IP messages, the following tcl program was used (based
on a snippet posted by Charles Hardin):
#!/usr/bin/tclsh
# Simple tcl client to test tcl_server
puts "Use empty line to exit"
set fo [socket localhost 6666]
puts -nonewline stdout "> "
flush stdout
while {[gets stdin line] > 0} {
puts "Message \"$line\" sent!"
puts $fo $line
flush $fo
# #OPENOCD SERVER ONLY RETURNS ACKS (NO DATA), SO THE "GETS" IS
BLOCKING
# puts "Waiting for server response"
# if {[eof $fo] || [catch {gets $fo line}]} {
# close $fo
# puts "Connection or server error."
# } else {
# puts "Server returned: $line"
# }
puts -nonewline stdout "> "
flush stdout
}
close $fo
I have also attached some Wireshark captured data, in plain text format.
Thank you!
No. Time Source Destination Protocol Info
1 0.000000 127.0.0.1 127.0.0.1 TCP 56676
> ircu [SYN] Seq=0 Win=32792 Len=0 MSS=16396 SACK_PERM=1 TSV=8764451 TSER=0 WS=7
Frame 1: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00
(00:00:00:00:00:00)
Internet Protocol, Src: 127.0.0.1 (127.0.0.1), Dst: 127.0.0.1 (127.0.0.1)
Transmission Control Protocol, Src Port: 56676 (56676), Dst Port: ircu (6666),
Seq: 0, Len: 0
Source port: 56676 (56676)
Destination port: ircu (6666)
[Stream index: 0]
Sequence number: 0 (relative sequence number)
Header length: 40 bytes
Flags: 0x02 (SYN)
Window size: 32792
Checksum: 0xfe30 [validation disabled]
Options: (20 bytes)
No. Time Source Destination Protocol Info
2 0.000031 127.0.0.1 127.0.0.1 TCP ircu >
56676 [SYN, ACK] Seq=0 Ack=1 Win=32768 Len=0 MSS=16396 SACK_PERM=1 TSV=8764451
TSER=8764451 WS=2
Frame 2: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00
(00:00:00:00:00:00)
Internet Protocol, Src: 127.0.0.1 (127.0.0.1), Dst: 127.0.0.1 (127.0.0.1)
Transmission Control Protocol, Src Port: ircu (6666), Dst Port: 56676 (56676),
Seq: 0, Ack: 1, Len: 0
Source port: ircu (6666)
Destination port: 56676 (56676)
[Stream index: 0]
Sequence number: 0 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 40 bytes
Flags: 0x12 (SYN, ACK)
Window size: 32768
Checksum: 0xfe30 [validation disabled]
Options: (20 bytes)
[SEQ/ACK analysis]
[This is an ACK to the segment in frame: 1]
[The RTT to ACK the segment was: 0.000031000 seconds]
No. Time Source Destination Protocol Info
3 0.000063 127.0.0.1 127.0.0.1 TCP 56676
> ircu [ACK] Seq=1 Ack=1 Win=32896 Len=0 TSV=8764451 TSER=8764451
Frame 3: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00
(00:00:00:00:00:00)
Internet Protocol, Src: 127.0.0.1 (127.0.0.1), Dst: 127.0.0.1 (127.0.0.1)
Transmission Control Protocol, Src Port: 56676 (56676), Dst Port: ircu (6666),
Seq: 1, Ack: 1, Len: 0
Source port: 56676 (56676)
Destination port: ircu (6666)
[Stream index: 0]
Sequence number: 1 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 32 bytes
Flags: 0x10 (ACK)
Window size: 32896 (scaled)
Checksum: 0xfe28 [validation disabled]
Options: (12 bytes)
[SEQ/ACK analysis]
[This is an ACK to the segment in frame: 2]
[The RTT to ACK the segment was: 0.000032000 seconds]
No. Time Source Destination Protocol Info
4 13.671042 127.0.0.1 127.0.0.1 TCP 56676
> ircu [PSH, ACK] Seq=1 Ack=1 Win=32896 Len=6 TSV=8765819 TSER=8764451
Frame 4: 72 bytes on wire (576 bits), 72 bytes captured (576 bits)
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00
(00:00:00:00:00:00)
Internet Protocol, Src: 127.0.0.1 (127.0.0.1), Dst: 127.0.0.1 (127.0.0.1)
Transmission Control Protocol, Src Port: 56676 (56676), Dst Port: ircu (6666),
Seq: 1, Ack: 1, Len: 6
Source port: 56676 (56676)
Destination port: ircu (6666)
[Stream index: 0]
Sequence number: 1 (relative sequence number)
[Next sequence number: 7 (relative sequence number)]
Acknowledgement number: 1 (relative ack number)
Header length: 32 bytes
Flags: 0x18 (PSH, ACK)
Window size: 32896 (scaled)
Checksum: 0xfe2e [validation disabled]
Options: (12 bytes)
[SEQ/ACK analysis]
[Number of bytes in flight: 6]
Data (6 bytes)
0000 68 61 6c 74 0d 0a halt..
Data: 68616c740d0a
[Length: 6]
No. Time Source Destination Protocol Info
5 13.671066 127.0.0.1 127.0.0.1 TCP ircu >
56676 [ACK] Seq=1 Ack=7 Win=32768 Len=0 TSV=8765819 TSER=8765819
Frame 5: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00
(00:00:00:00:00:00)
Internet Protocol, Src: 127.0.0.1 (127.0.0.1), Dst: 127.0.0.1 (127.0.0.1)
Transmission Control Protocol, Src Port: ircu (6666), Dst Port: 56676 (56676),
Seq: 1, Ack: 7, Len: 0
Source port: ircu (6666)
Destination port: 56676 (56676)
[Stream index: 0]
Sequence number: 1 (relative sequence number)
Acknowledgement number: 7 (relative ack number)
Header length: 32 bytes
Flags: 0x10 (ACK)
Window size: 32768 (scaled)
Checksum: 0xfe28 [validation disabled]
Options: (12 bytes)
[SEQ/ACK analysis]
[This is an ACK to the segment in frame: 4]
[The RTT to ACK the segment was: 0.000024000 seconds]
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