Stuck permanently waiting when trying to discover characteristics for peripheral

[visceralfield]

Using code equivalent to the example file, with the change described in #30 in order to allow connection to be successful. When the code reaches the point of attempting to discover characteristics, it hangs in wait_until_done permanently. The backtrace from GDB is as follows:

`PERIPHERAL:

EA:BC:02:5E:A6:C6 properties: PeripheralProperties { address: EA:BC:02:5E:A6:C6, address_type: Random, local_name: Some("LOCK-INIT"), tx_power_level: None, manufacturer_data: Some([2, 162, 255, 255, 255, 253, 5, 71, 147, 2, 0, 0, 0, 205, 4]), discovery_count: 16, has_scan_response: false }, characteristics: {}
[New Thread 0x769ff400 (LWP 14289)]

Trying to discover characteristics...

^C
Thread 1 "hello_world" received signal SIGINT, Interrupt.
0x76f719a4 in __pthread_cond_wait (cond=0x51fe28, mutex=0x51fe08) at pthread_cond_wait.c:188
188 pthread_cond_wait.c: No such file or directory.
(gdb) bt
#0 0x76f719a4 in __pthread_cond_wait (cond=0x51fe28, mutex=0x51fe08) at pthread_cond_wait.c:188
#1 0x00460784 in std::sys::unix::condvar::Condvar::wait::hd4783c7e53c7894c (self=0x51fe28, mutex=0x51fe08)
at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/sys/unix/condvar.rs:69
#2 0x004236cc in std::sys_common::condvar::Condvar::wait::h1834f96141448671 (self=0x51fe28, mutex=0x51fe08)
at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/sys_common/condvar.rs:41
#3 0x00459228 in std::sync::condvar::Condvar::wait::hb2f047c82f3cfd71 (self=0x51fe90, guard=...)
at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/sync/condvar.rs:204
#4 0x0047bb74 in rumble::bluez::adapter::peripheral::Peripheral::wait_until_done::h02e167200bfd64a3 (operation=...)
at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:289
#5 0x0047b848 in rumble::bluez::adapter::peripheral::Peripheral::request_raw::he3462da61a8e24b0 (self=0x7efff168, data=...)
at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:208
#6 0x0047e048 in _$LT$rumble..bluez..adapter..peripheral..Peripheral$u20$as$u20$rumble..api..Peripheral$GT$::discover_characteristics_in_range::h5b974183dd98d25e (self=0x7efff168, start=1, end=65535)
at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:454
#7 0x0047dd64 in $LT$rumble..bluez..adapter..peripheral..Peripheral$u20$as$u20$rumble..api..Peripheral$GT$::discover_characteristics::h156ac34c88075480 (self=0x7efff168)
at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:444
#8 0x00407240 in hello_world::main::h84896516970ce619 () at src/main.rs:46
#9 0x00408e08 in std::rt::lang_start::$u7b$$u7b$closure$u7d$$u7d$::h0a710e18e571eb65 ()
at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/rt.rs:64
#10 0x004df3e4 in {{closure}} () at src/libstd/rt.rs:49
#11 do_call<closure,i32> () at src/libstd/panicking.rs:293
#12 0x004e2678 in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:87
#13 0x004dfe38 in try<i32,closure> () at src/libstd/panicking.rs:272
#14 catch_unwind<closure,i32> () at src/libstd/panic.rs:388
#15 lang_start_internal () at src/libstd/rt.rs:48
#16 0x00408dd8 in std::rt::lang_start::h14f3dad8e1b8c801 (main=0x406d70 <hello_world::main::h84896516970ce619>, argc=1,
argv=0x7efff764) at /rustc/3c235d5600393dfe6c36eeed34042efad8d4f26e/src/libstd/rt.rs:64
#17 0x00407648 in main ()
`

This library looks really promising, I would love to hear back on this about how a fix may be possible. Info on vars in the most relevant frames is follows, I can capture more debug output on request,
including output from my peripheral, which currently outputs nothing of relevance during the wait.

(gdb) frame 4 #4 0x0047bb74 in rumble::bluez::adapter::peripheral::Peripheral::wait_until_done::h02e167200bfd64a3 (operation=...) at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:289 289 done = cvar.wait(done).unwrap(); (gdb) locals Undefined command: "locals". Try "help". (gdb) info locals done = std::sync::mutex::MutexGuard<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>> {__lock: 0x51fe68, __poison: std::sys_common::poison::Guard {panicking: false}} lock = 0x51fe68 cvar = 0x51fe90 on_finish = 0x51fea0 pair2 = alloc::sync::Arc<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>>, std::sync::condvar::Condvar)> {ptr: core::ptr::NonNull<alloc::sync::ArcInner<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>>, std::sync::condvar::Condvar)>> {pointer: 0x51fe60}, phantom: core::marker::PhantomData<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>>, std::sync::condvar::Condvar)>} pair = alloc::sync::Arc<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>>, std::sync::condvar::Condvar)> {ptr: core::ptr::NonNull<alloc::sync::ArcInner<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>>, std::sync::condvar::Condvar)>> {pointer: 0x51fe60}, phantom: core::marker::PhantomData<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec<u8>, rumble::Error>>>, std::sync::condvar::Condvar)>} (gdb) frame 6 #6 0x0047e048 in _$LT$rumble..bluez..adapter..peripheral..Peripheral$u20$as$u20$rumble..api..Peripheral$GT$::discover_characteristics_in_range::h5b974183dd98d25e (self=0x7efff168, start=1, end=65535) at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:454 454 let data = self.request_raw(&mut buf)?; (gdb) info locals buf = alloc::vec::Vec<u8> {buf: alloc::raw_vec::RawVec<u8, alloc::alloc::Global> {ptr: core::ptr::Unique<u8> {pointer: 0x51fb28 "\b\001\000", _marker: core::marker::PhantomData<u8>}, cap: 7, a: alloc::alloc::Global}, len: 7} start = 1 results = alloc::vec::Vec<rumble::api::Characteristic> {buf: alloc::raw_vec::RawVec<rumble::api::Characteristic, alloc::alloc::Global> {ptr: core::ptr::Unique<rumble::api::Characteristic> {pointer: 0x2, _marker: core::marker::PhantomData<rumble::api::Characteristic>}, cap: 0, a: alloc::alloc::Global}, len: 0} (gdb) frame 7 #7 0x0047dd64 in _$LT$rumble..bluez..adapter..peripheral..Peripheral$u20$as$u20$rumble..api..Peripheral$GT$::discover_characteristics::h156ac34c88075480 (self=0x7efff168) at /home/josh/.cargo/git/checkouts/rumble-909815939d4a9900/3117372/src/bluez/adapter/peripheral.rs:444 444 self.discover_characteristics_in_range(0x0001, 0xFFFF) (gdb) info locals No locals.

[felsweg]

I experienced the same problem, but only after initial discovery and bindings. You could store them, if that helps. I experience a similar problem, when reusing characteristics. The second time I try to use them (eg. sending a command), seems not to work. I haven't been looked into this issue more deeply, yet.