Hi,
Thanks to your great examples i was able to connect to my device and read characteristic values with notifications. However, when i try to get the device to notify on several characteristics i mess up the state machine.
I have expanded the already existing lambda. The program runs as intended with only the first of the two if statements.
std::function<void()> cb = [&gatt, ¬ify_cb_roll, ¬ify_cb_pitch, &enable](){
pretty_print_tree(gatt);
for(auto& service: gatt.primary_services)
for(auto& characteristic: service.characteristics) {
if(service.uuid == UUID("8efc0000-6ee9-4c70-8615-3456c364d7e6") && characteristic.uuid == UUID("8efc0001-6ee9-4c70-8615-3456c364d7e6"))
{
cout << "Found and subscribed to roll characteristic\n";
characteristic.cb_notify_or_indicate = notify_cb_roll;
characteristic.set_notify_and_indicate(enable, false);
}
if(service.uuid == UUID("8efc0000-6ee9-4c70-8615-3456c364d7e6") && characteristic.uuid == UUID("8efc0002-6ee9-4c70-8615-3456c364d7e6"))
{
cout << "Found and subscribed to pitch characteristic\n";
characteristic.cb_notify_or_indicate = notify_cb_pitch;
characteristic.set_notify_and_indicate(enable, false);
}
}
};
When the code looks as above i get the following output when connecting to my device.
info 1543589836.865952: Socket success: 228 (/home/asmus/Documents/Projects/CppBLE/libblepp-master/src/blestatemachine.cc)
info 1543589836.866000: Socket success: 271 (/home/asmus/Documents/Projects/CppBLE/libblepp-master/src/blestatemachine.cc)
info 1543589836.866020: Socket success: 174 (/home/asmus/Documents/Projects/CppBLE/libblepp-master/src/blestatemachine.cc)
info 1543589836.866036: options.omtu = 672
info 1543589836.866053: options.imtu = 672
info 1543589836.866067: options.flush_to = 65535
info 1543589836.866080: options.mode = 0
info 1543589836.866095: options.fcs = 1
info 1543589836.866109: options.max_tx = 3
info 1543589836.866121: options.txwin_size = 63
error 1543589836.866153: Error on line: 298 (/home/asmus/Documents/Projects/CppBLE/libblepp-master/src/blestatemachine.cc): Operation now in progress
Probably connected?
info 1543589837.321752: Socket success: 493 (/home/asmus/Documents/Projects/CppBLE/libblepp-master/src/blestatemachine.cc)
info 1543589837.321819: errval = Success
From read_and_process_next - We're in state: 3
From read_and_process_next - We're in state: 3
From read_and_process_next - We're in state: 4
From read_and_process_next - We're in state: 4
From read_and_process_next - We're in state: 4
From read_and_process_next - We're in state: 4
From read_and_process_next - We're in state: 4
From read_and_process_next - We're in state: 5
From read_and_process_next - We're in state: 5
Primary services:
Start: 0001 End: 0009 UUID: 1800
org.bluetooth.service.generic_access: Generic Access
Characteristic: 2a00
Start: 0002 End: 0003
Flags: Read Write
Value at handle: 3
Characteristic: 2a01
Start: 0004 End: 0005
Flags: Read
Value at handle: 5
Characteristic: 2a04
Start: 0006 End: 0007
Flags: Read
Value at handle: 7
Characteristic: 2aa6
Start: 0008 End: 0009
Flags: Read
Value at handle: 9
Start: 000a End: 000d UUID: 1801
org.bluetooth.service.generic_attribute: Generic Attribute
Characteristic: 2a05
Start: 000b End: 000d
Flags: Indicate
Value at handle: 12
CCC: (000d) 0000
Start: 000e End: ffff UUID: 8efc0000-6ee9-4c70-8615-3456c364d7e6
Unknown
Characteristic: 8efc0001-6ee9-4c70-8615-3456c364d7e6
Start: 000f End: 0011
Flags: Read Write Notify
Value at handle: 16
CCC: (0011) 0000
Characteristic: 8efc0002-6ee9-4c70-8615-3456c364d7e6
Start: 0012 End: ffff
Flags: Notify
Value at handle: 19
CCC: (0014) 0000
Found and subscribed to roll characteristic
In set_notify_and_indicate
In set_notify_and_indicate - State:6
Found and subscribed to pitch characteristic
In set_notify_and_indicate
Oops, someone fouled up: Error trying to issue command mid state
info 1543589838.339664: Socket success: 151 (/home/asmus/Documents/Projects/CppBLE/libblepp-master/src/blestatemachine.cc)
To debug the program it prints the state and which function it exits from. When the state machine enters the set_notify_and_indicate function the state is checked and it exists if the state is not idle.
At the end of the function, the state is set to AwaitingWriteResponse before state_machine_write() is called. Next time the function is called it exits, since the state is still AwaitingWriteResponse.
I suspect that this is not really a bug, but rather a lack of understanding of the state machine. How do i properly turn on notifications for several characteristics, without breaking the state machine?
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