On Wed, Mar 2, 2022 at 10:50 AM Andrew Burgess <aburgess@redhat.com> wrote:
>
> William Tambe via Gdb-patches <gdb-patches@sourceware.org> writes:
>
> > Regarding this issue, support for gdbserver has been implemented here:
> > https://github.com/fontamsoc/binutils-gdb/blob/b2eeeae0/gdbserver/linux-pu32-low.cc
> >
> > Support for gdb has been implemented here:
> > https://github.com/fontamsoc/binutils-gdb/blob/b2eeeae0/gdb/pu32-tdep.c
> >
> > gdb is able to successfully connect to gdbserver and start a program
> > on the target; however, gdb is unable to fetch registers and instead
> > shows <unavailable> as follow:
> >
> > (gdb) info registers
> > r0             <unavailable>
> > r1             <unavailable>
> > r2             <unavailable>
> > r3             <unavailable>
> > r4             <unavailable>
> > r5             <unavailable>
> > r6             <unavailable>
> > r7             <unavailable>
> > r8             <unavailable>
> > r9             <unavailable>
> > r10            <unavailable>
> > r11            <unavailable>
> > r12            <unavailable>
> > r13            <unavailable>
> > r14            <unavailable>
> > r15            <unavailable>
> > pc             <unavailable>
> >
> > Find attached full `gdbserver --debug --remote-debug` logs as well as
> > gdb logs.
>
> You should consider using 'set debug remote 1' on the GDB side to
> capture the remote packets from that perspective.  I'm particularlly
> interested in the reply to the 'g' packet, but the complete logs would
> be useful.  This information doesn't seem to be visible in the gdbserver
> output (or I'm missing it).

Please, find attached similar gdb and gdbserver logs; with `set debug
remote 1` used on the GDB side.

>
> Thanks,
> Andrew
>
> >
> > Any idea what might have been missed while implementing gdbserver support ?
> > Would you suggest ways to debug the issue ?
> > tambewilliam@kubuntu20200502:~$ sudo /opt/pu32-toolchain/bin/pu32-elf-gdb -x buildroot-build/staging/usr/share/buildroot/gdbinit -ex 'target extended-remote /dev/ttyUSB2' -ex 'set cwd /' && -ex 'monitor set debug 1' -ex 'monitor set remote-debug 1'
> > GNU gdb (GDB) 11.0.50.20210718-git
> > Copyright (C) 2021 Free Software Foundation, Inc.
> > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> > This is free software: you are free to change and redistribute it.
> > There is NO WARRANTY, to the extent permitted by law.
> > Type "show copying" and "show warranty" for details.
> > This GDB was configured as "--host=x86_64-pc-linux-gnu --target=pu32-elf".
> > Type "show configuration" for configuration details.
> > For bug reporting instructions, please see:
> > <https://www.gnu.org/software/gdb/bugs/>.
> > Find the GDB manual and other documentation resources online at:
> >     <http://www.gnu.org/software/gdb/documentation/>.
> >
> > For help, type "help".
> > Type "apropos word" to search for commands related to "word".
> > warning: File "/home/tambewilliam/.gdbinit" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
> > To enable execution of this file add
> >         add-auto-load-safe-path /home/tambewilliam/.gdbinit
> > line to your configuration file "/root/.config/gdb/gdbinit".
> > To completely disable this security protection add
> >         set auto-load safe-path /
> > line to your configuration file "/root/.config/gdb/gdbinit".
> > For more information about this security protection see the
> > "Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
> >         info "(gdb)Auto-loading safe path"
> > buildroot-build/staging/usr/share/buildroot/gdbinit: No such file or directory.
> > Remote debugging using /dev/ttyUSB2
> > (gdb) set remote exec-file /bin/ls
> > (gdb) r -l /
> > Starting program:  -l /
> > Reading /usr/bin/busybox from remote target...
> > warning: File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
> > Reading /usr/bin/busybox from remote target...
> > Reading symbols from target:/usr/bin/busybox...
> > (No debugging symbols found in target:/usr/bin/busybox)
> > warning: Target-supplied registers are not supported by the current architecture
> > PC register is not available
> > (gdb) info registers
> > r0             <unavailable>
> > r1             <unavailable>
> > r2             <unavailable>
> > r3             <unavailable>
> > r4             <unavailable>
> > r5             <unavailable>
> > r6             <unavailable>
> > r7             <unavailable>
> > r8             <unavailable>
> > r9             <unavailable>
> > r10            <unavailable>
> > r11            <unavailable>
> > r12            <unavailable>
> > r13            <unavailable>
> > r14            <unavailable>
> > r15            <unavailable>
> > pc             <unavailable>
> > (gdb)
> > # gdbserver --debug --remote-debug --multi /dev/ttyS1 &
> > [2] 94
> > root@buildroot:~
> > # sigchld_handler
> > sigchld_handler
> > sigchld_handler
> > sigchld_handler
> > sigchld_handler
> > Remote debugging using /dev/ttyS1
> >
> > root@buildroot:~
> > #
> > root@buildroot:~
> > #
> > root@buildroot:~
> > #
> > root@buildroot:~
> > # handling possible serial event
> > [getpkt: discarding char '+']
> > getpkt ("qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;memory-tagging+");  [sending ack]
> > [sent ack]
> > putpkt ("$PacketSize=47ff;QPassSignals+;QProgramSignals+;QStartupWithShell+;QEnvironmentHexEncoded+;QEnvironmentReset+;QEnvironmentUnset+;QSetWorkingDir+;qXfer:libraries-svr4:read+;augmented-libraries-svr4-read+;qXfer:auxv:read+;qXfer:siginfo:read+;qXfer:siginfo:write+;qXfer:features:read+;qXfer:osdata:read+;multiprocess+;fork-events+;vfork-events+;exec-events+;QNonStop+;QDisableRandomization+;qXfer:threads:read+;ConditionalBreakpoints+;BreakpointCommands+;QAgent+;Qbtrace:bts+;Qbtrace-conf:bts:size+;Qbtrace:pt+;Qbtrace-conf:pt:size+;Qbtrace:off+;qXfer:btrace:read+;qXfer:btrace-conf:read+;swbreak+;hwbreak+;qXfer:exec-file:read+;vContSupported+;QThreadEvents+;no-resumed+#21"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vMustReplyEmpty");  [sending ack]
> > [sent ack]
> > putpkt ("$#00"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("!");  [sending ack]
> > [sent ack]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("QProgramSignals:0;1;3;4;6;7;8;9;a;b;c;d;e;f;10;11;12;13;14;15;16;17;18;19;1a;1b;1c;1d;1e;1f;20;21;22;23;24;25;26;27;28;29;2a;2b;2c;2d;2e;2f;30;31;32;33;34;35;36;37;38;39;3a;3b;3c;3d;3e;3f;40;41;42;43;44;45;46;47;48;49;4a;4b;4c;4d;4e;4f;50;51;52;53;54;55;56;57;58;59;5a;5b;5c;5d;5e;5f;60;61;62;63;64;65;66;67;68;69;6a;6b;6c;6d;6e;6f;70;71;72;73;74;75;76;77;78;79;7a;7b;7c;7d;7e;7f;80;81;82;83;84;85;86;87;88;89;8a;8b;8c;8d;8e;8f;90;91;92;93;94;95;96;97;");  [sending ack]
> > [sent ack]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("Hgp0.0");  [sending ack]
> > [sent ack]
> > putpkt ("$E01#a6"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qXfer:features:read:target.xml:0,1000");  [sending ack]
> > [sent ack]
> > putpkt ("$E01#a6"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("QNonStop:0");  [sending ack]
> > [sent ack]
> > linux_async (0), previous=0
> > [all-stop mode enabled]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qTStatus");  [sending ack]
> > [sent ack]
> > putpkt ("$#00"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("?");  [sending ack]
> > [sent ack]
> >>>>> entering void linux_process_target::stop_all_lwps(int, lwp_info*)
> > stop_all_lwps (stop, except=none)
> > wait_for_sigstop: pulling events
> > LWFE: waitpid(-1, ...) returned -1,
> > LLW: exit (no unwaited-for LWP)
> > stop_all_lwps done, setting stopping_threads back to !stopping
> > <<<< exiting void linux_process_target::stop_all_lwps(int, lwp_info*)
> > putpkt ("$W00#b7"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("QDisableRandomization:1");  [sending ack]
> > [sent ack]
> > [address space randomization disabled]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("QStartupWithShell:1");  [sending ack]
> > [sent ack]
> > [Inferior will be started with shell]putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("QEnvironmentReset");  [sending ack]
> > [sent ack]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("QSetWorkingDir:2f");  [sending ack]
> > [sent ack]
> > [Set the inferior's current directory to /]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vRun;2f62696e2f6c73;2d6c;2f");  [sending ack]
> > [sent ack]
> > args: -l /
> >>>>> entering ptid_t linux_process_target::wait_1(ptid_t, target_waitstatus*, target_wait_flags)
> > wait_1: [Process 97]
> > LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
> > leader_pid=97, leader_lp!=NULL=1, num_lwps=1, zombie=0
> > sigsuspend'ing
> > sigchld_handler
> > LWFE: waitpid(-1, ...) returned 97, ERRNO-OK
> > LLW: waitpid 97 received SIGTRAP - Trace/breakpoint trap (stopped)
> > LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
> > Hit a non-gdbserver trap event.
> >>>>> entering void linux_process_target::stop_all_lwps(int, lwp_info*)
> > stop_all_lwps (stop, except=none)
> > wait_for_sigstop: pulling events
> > LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
> > leader_pid=97, leader_lp!=NULL=1, num_lwps=1, zombie=0
> > LLW: exit (no unwaited-for LWP)
> > stop_all_lwps done, setting stopping_threads back to !stopping
> > <<<< exiting void linux_process_target::stop_all_lwps(int, lwp_info*)
> > Checking whether LWP 97 needs to move out of the jump pad...no
> > wait_1 ret = LWP 97.97, 1, 5
> > <<<< exiting ptid_t linux_process_target::wait_1(ptid_t, target_waitstatus*, target_wait_flags)
> >>>>> entering virtual void linux_process_target::resume(thread_resume*, size_t)
> > linux_resume:
> > already continuing LWP 97 at GDB's request
> > Resuming, no pending status or step over needed
> > linux_resume done
> > <<<< exiting virtual void linux_process_target::resume(thread_resume*, size_t)
> >>>>> entering ptid_t linux_process_target::wait_1(ptid_t, target_waitstatus*, target_wait_flags)
> > wait_1: [Process 97]
> > LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
> > RSRL: resuming stopped-resumed LWP LWP 97.97 at 0: step=0
> > Resuming lwp 97 (continue, signal 0, stop not expected)
> > leader_pid=97, leader_lp!=NULL=1, num_lwps=1, zombie=0
> > sigsuspend'ing
> > sigchld_handler
> > LWFE: waitpid(-1, ...) returned 97, ERRNO-OK
> > LLW: waitpid 97 received SIGTRAP - Trace/breakpoint trap (stopped)
> > LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
> > Hit a non-gdbserver trap event.
> >>>>> entering void linux_process_target::stop_all_lwps(int, lwp_info*)
> > stop_all_lwps (stop, except=none)
> > wait_for_sigstop: pulling events
> > LWFE: waitpid(-1, ...) returned 0, ERRNO-OK
> > leader_pid=97, leader_lp!=NULL=1, num_lwps=1, zombie=0
> > LLW: exit (no unwaited-for LWP)
> > stop_all_lwps done, setting stopping_threads back to !stopping
> > <<<< exiting void linux_process_target::stop_all_lwps(int, lwp_info*)
> > Checking whether LWP 97 needs to move out of the jump pad...no
> > wait_1 ret = LWP 97.97, 1, 5
> > <<<< exiting ptid_t linux_process_target::wait_1(ptid_t, target_waitstatus*, target_wait_flags)
> > Process /bin/ls created; pid = 97
> > Writing resume reply for LWP 97.97:1
> > putpkt ("$T0500:0*"00;0e:0*"00;0f:0*"00;10:0*"00;thread:p61.61;core:0;#90"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qAttached:61");  [sending ack]
> > [sent ack]
> > putpkt ("$0#30"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qXfer:exec-file:read:61:0,1000");  [sending ack]
> > [sent ack]
> > putpkt ("$l/usr/bin/busybox#98"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:setfs:0");  [sending ack]
> > [sent ack]
> > putpkt ("$F0#76"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:open:6a7573742070726f62696e67,0,1c0");  [sending ack]
> > [sent ack]
> > putpkt ("$F-1,2#02"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:setfs:61");  [sending ack]
> > [sent ack]
> > putpkt ("$F0#76"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:open:2f7573722f62696e2f62757379626f78,0,0");  [sending ack]
> > [sent ack]
> > putpkt ("$F4#7a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:4,47ff,0");  [sending ack]
> > [sent ack]
> > putpkt ("$F4734;ELF"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:4,47ff,1ce288");  [sending ack]
> > [sent ack]
> > putpkt ("$F370;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:fstat:4");  [sending ack]
> > [sent ack]
> > putpkt ("$F40;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:4,47ff,34");  [sending ack]
> > [sent ack]
> > putpkt ("$F4733;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:4,47ff,1ce1a1");  [sending ack]
> > [sent ack]
> > putpkt ("$F457;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:4,47ff,b4");  [sending ack]
> > [sent ack]
> > putpkt ("$F4733;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:fstat:4");  [sending ack]
> > [sent ack]
> > putpkt ("$F40;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:open:2f7573722f62696e2f62757379626f78,0,0");  [sending ack]
> > [sent ack]
> > putpkt ("$F5#7b"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:5,47ff,0");  [sending ack]
> > [sent ack]
> > putpkt ("$F4734;ELF"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:5,47ff,1ce288");  [sending ack]
> > [sent ack]
> > putpkt ("$F370;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:fstat:5");  [sending ack]
> > [sent ack]
> > putpkt ("$F40;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:5,47ff,34");  [sending ack]
> > [sent ack]
> > putpkt ("$F4733;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:5,47ff,1ce1a1");  [sending ack]
> > [sent ack]
> > putpkt ("$F457;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:5,47ff,b4");  [sending ack]
> > [sent ack]
> > putpkt ("$F4733;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:fstat:5");  [sending ack]
> > [sent ack]
> > putpkt ("$F40;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qSymbol::");  [sending ack]
> > [sent ack]
> > Trying host libthread_db library: libthread_db.so.1.
> > dlopen failed: libthread_db.so.1: cannot open shared object file: No such file or directory.
> > thread_db_load_search returning 0
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qSymbol::");  [sending ack]
> > [sent ack]
> > Trying host libthread_db library: libthread_db.so.1.
> > dlopen failed: libthread_db.so.1: cannot open shared object file: No such file or directory.
> > thread_db_load_search returning 0
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qXfer:exec-file:read:61:0,1000");  [sending ack]
> > [sent ack]
> > putpkt ("$l/usr/bin/busybox#98"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qOffsets");  [sending ack]
> > [sent ack]
> > putpkt ("$#00"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("Hgp61.61");  [sending ack]
> > [sent ack]
> > putpkt ("$OK#9a"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qXfer:features:read:target.xml:0,1000");  [sending ack]
> > [sent ack]
> > putpkt ("$l<?xml version="1.0"?>
> > <!DOCTYPE target SYSTEM "gdb-target.dtd">
> > <target>
> >   <architecture>pu32</architecture>
> >   <osabi>GNU/Linux</osabi>
> >   <feature name="org.gnu.gdb.pu32.core">
> >  * <reg name="sp" bitsize="32" type="uint32" regnum="0"/>
> >  * <reg name="r1" bitsize="32" type="uint32" regnum="1"/>
> >  * <reg name="r2" bitsize="32" type="uint32" regnum="2"/>
> >  * <reg name="r3" bitsize="32" type="uint32" regnum="3"/>
> >  * <reg name="r4" bitsize="32" type="uint32" regnum="4"/>
> >  * <reg name="r5" bitsize="32" type="uint32" regnum="5"/>
> >  * <reg name="r6" bitsize="32" type="uint32" regnum="6"/>
> >  * <reg name="r7" bitsize="32" type="uint32" regnum="7"/>
> >  * <reg name="r8" bitsize="32" type="uint32" regnum="8"/>
> >  * <reg name="r9" bitsize="32" type="uint32" regnum="9"/>
> >  * <reg name="r10" bitsize="32" type="uint32" regnum="10"/>
> >  * <reg name="r11" bitsize="32" type="uint32" regnum="11"/>
> >  * <reg name="r12" bitsize="32" type="uint32" regnum="12"/>
> >  * <reg name="r13" bitsize="32" type="uint32" regnum="13"/>
> >  * <reg name="r14" bitsize="32" type="uint32" regnum="14"/>
> >  * <reg name="r15" bitsize="32" type="uint32" regnum="15"/>
> >  * <reg name="pc" bitsize="32" type="uint32" regnum="16"/>
> >   </feature>
> > </target>
> > #ef"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("vFile:pread:4,47ff,b4");  [sending ack]
> > [sent ack]
> > putpkt ("$F4733;"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("g");  [sending ack]
> > [sent ack]
> > putpkt ("$x*}x*C#04"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qXfer:libraries-svr4:read::0,1000");  [sending ack]
> > [sent ack]
> > putpkt ("$E01#a6"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("qXfer:auxv:read::0,1000");  [sending ack]
> > [sent ack]
> > putpkt ("$l"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000034,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*050*"050f9cb1c00f9cb1c00050*"0010*!#ce"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000054,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*"fccb1c00fcdb1c50fcdb1c50a5150* 1c370*!60*"0010*!#1c"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000074,20");  [sending ack]
> > [sent ack]
> > putpkt ("$040*"b40*"b40* 50b40* 5020*"020*"0040*"040*"#58"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000094,20");  [sending ack]
> > [sent ack]
> > putpkt ("$070*"fccb1c00fcdb1c50fcdb1c50180*"540*"040*"040*"#ff"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000034,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*050*"050f9cb1c00f9cb1c00050*"0010*!#ce"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000054,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*"fccb1c00fcdb1c50fcdb1c50a5150* 1c370*!60*"0010*!#1c"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000074,20");  [sending ack]
> > [sent ack]
> > putpkt ("$040*"b40*"b40* 50b40* 5020*"020*"0040*"040*"#58"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000094,20");  [sending ack]
> > [sent ack]
> > putpkt ("$070*"fccb1c00fcdb1c50fcdb1c50180*"540*"040*"040*"#ff"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000034,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*050*"050f9cb1c00f9cb1c00050*"0010*!#ce"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000054,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*"fccb1c00fcdb1c50fcdb1c50a5150* 1c370*!60*"0010*!#1c"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000074,20");  [sending ack]
> > [sent ack]
> > putpkt ("$040*"b40*"b40* 50b40* 5020*"020*"0040*"040*"#58"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000094,20");  [sending ack]
> > [sent ack]
> > putpkt ("$070*"fccb1c00fcdb1c50fcdb1c50180*"540*"040*"040*"#ff"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000034,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*050*"050f9cb1c00f9cb1c00050*"0010*!#ce"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000054,20");  [sending ack]
> > [sent ack]
> > putpkt ("$010*"fccb1c00fcdb1c50fcdb1c50a5150* 1c370*!60*"0010*!#1c"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000074,20");  [sending ack]
> > [sent ack]
> > putpkt ("$040*"b40*"b40* 50b40* 5020*"020*"0040*"040*"#58"); [looking for ack]
> > [received '+' (0x2b)]
> > handling possible serial event
> > getpkt ("m50000094,20");  [sending ack]
> > [sent ack]
> > putpkt ("$070*"fccb1c00fcdb1c50fcdb1c50180*"540*"040*"040*"#ff"); [looking for ack]
> > [received '+' (0x2b)]
> >
> > root@buildroot:~
>