Test not working

[mgrojo]

I tried to test the binding, had to make some changes in order to compile with this configuration:

• Package: libmosquitto-dev
• Version: 1.6.9-1
• Distribution: Ubuntu 20.04.3 LTS
• gnatgcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

The changes were related to Interfaces.C.Extensions.bool now being a new Boolean instead of a numeric type. (I can provide this changes as a pull request if needed).

The problem is that the test procedure does not print anything. I got this information.

ltrace output:

mosquitto_connect(0x561110b75b70, 0x561110b783b0, 1883, 0)                                           = 3
interfaces__c__strings__free(0x561110b783b0, 0x561110b783b0, 1792, 0)                                = 0
system__secondary_stack__ss_mark(0x7fffdb1df9e0, 0x561110b783b0, 0, 7)                               = 0x7fffdb1df9e0
system__img_int__image_integer(3, 0x7fffdb1df910, 0x56110eec9768, 0x7fffdb1df910)                    = 2
memcpy(0x7fffdb1df880, " 3", 2)                                                                      = 0x7fffdb1df880
system__secondary_stack__ss_allocate(12, 0x3320, 0, 0x3320)                                          = 0x56110eece530
memcpy(0x56110eece538, "3", 1)                                                                       = 0x56110eece538
mosquitto_strerror(3, 0x7fffdb1df881, 0x56110eece530, 51)                                            = 0x7fd612d23c98
interfaces__c__strings__value__3(0x7fd612d23c98, 0x7fffdb1df881, 0x7fd612d23f38, 51)                 = 0x56110eece588
system__concat_4__str_concat_4(0x7fffdb1df950, 0x7fffdb1dfa08, 0x56110eec9772, 0x56110eec9780)       = 0x7fffdb1df954
__gnat_raise_exception(0x56110eece0a0, 0x7fffdb1df950, 0x7fffdb1dfa10, 0x7fffdb1df950)               = 0x561110b756a0
system__secondary_stack__ss_release(0x7fffdb1df9e0, 0x56110eec8619, 0, 0x56110eec8619)               = 0x56110eece4e0
_Unwind_Resume(0x561110b756a0, 0x56110eec8619, 0, 0x56110eec8619 <unfinished ...>
ada__exceptions__triggered_by_abort(0x7fffdb1dfac0, 0x56110eec06cd, 0, 0x56110eec06cd)               = 0x56110eece000

The exception was not visible, but adding a Put_Line shows this:

[3] Invalid function arguments provided.

Any idea about the issue? How could this be debugged further?

[persan]

Apparently the compiler has moved on, so pleas send the pull request.

[mgrojo]

OK, PR done.

[mgrojo]

The error about "Invalid function arguments provided." seems related to eclipse/mosquitto#2117 (comment)

I was able to make it work, setting the keepalive to 30, but then another issue was uncovered in passing this value. The C library expects integer seconds, while the Ada binding passes milliseconds. I'll add this to the pull request.

Another possible change is setting a different default for keepalive, since 0 seems problematic with some mosquitto versions/MQTT implementations. For the moment, I've changed the keepalive value only in the test program.