felsweg
commented
4 years ago 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.
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)
2 0x004236cc in std::sys_common::condvar::Condvar::wait::h1834f96141448671 (self=0x51fe28, mutex=0x51fe08)
3 0x00459228 in std::sync::condvar::Condvar::wait::hb2f047c82f3cfd71 (self=0x51fe90, guard=...)
4 0x0047bb74 in rumble::bluez::adapter::peripheral::Peripheral::wait_until_done::h02e167200bfd64a3 (operation=...)
5 0x0047b848 in rumble::bluez::adapter::peripheral::Peripheral::request_raw::he3462da61a8e24b0 (self=0x7efff168, data=...)
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)
7 0x0047dd64 in _$LT$rumble..bluez..adapter..peripheral..Peripheral$u20$as$u20$rumble..api..Peripheral$GT$::discover_characteristics::h156ac34c88075480 (self=0x7efff168)
8 0x00407240 in hello_world::main::h84896516970ce619 () at src/main.rs:46
9 0x00408e08 in std::rt::langstart::$u7b$$u7b$closure$u7d$$u7d$::h0a710e18e571eb65 ()
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, argc=1,
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=...)
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, 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, 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, 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, rumble::Error>>>, std::sync::condvar::Condvar)>}
pair = alloc::sync::Arc<(std::sync::mutex::Mutex<core::option::Option<core::result::Result<alloc::vec::Vec, 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, 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, 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$::discover_characteristics_in_range::h5b974183dd98d25e (self=0x7efff168, start=1, end=65535)
454 let data = self.request_raw(&mut buf)?; (gdb) info locals buf = alloc::vec::Vec {buf: alloc::raw_vec::RawVec<u8, alloc::alloc::Global> {ptr: core::ptr::Unique {pointer: 0x51fb28 "\b\001\000", _marker: core::marker::PhantomData}, cap: 7, a: alloc::alloc::Global}, len: 7}
start = 1
results = alloc::vec::Vec {buf: alloc::raw_vec::RawVec<rumble::api::Characteristic, alloc::alloc::Global> {ptr: core::ptr::Unique {pointer: 0x2, _marker: core::marker::PhantomData}, cap: 0, a: alloc::alloc::Global}, len: 0}
(gdb) frame 7
7 0x0047dd64 in _$LT$rumble..bluez..adapter..peripheral..Peripheral$u20$as$u20$rumble..api..Peripheral$GT$::discover_characteristics::h156ac34c88075480 (self=0x7efff168)
444 self.discover_characteristics_in_range(0x0001, 0xFFFF) (gdb) info locals No locals.`