gdb_server: Improve logging of GDB-remote packets
- Print also the target name, not just the packet contents.
This is important when there are more GDB servers (more
debug-able targets) active in one OpenOCD session.
- Log also the received Ctrl-C requests coming from GDB
(one byte 0x3), ACKs ("+") and NACKs ("-").
- Do not print zero-length incoming packets (this occurred
when Ctrl-C packets were received).
- Removed a stray apostrophe "'" that got printed
in gdb_log_outgoing_packet()
Signed-off-by: Jan Matyas <matyas@codasip.com>
Change-Id: If68fe0a8aa635165d0bbe6fa0e48a4645a02da67
Reviewed-on: https://review.openocd.org/c/openocd/+/6879
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>