Open [& Connect] @ ctor (RAII): HCIComm, L2CAPComm, GATTHandler, simplifying 'connect' lifecycle

Further:
- L2CAPComm
-- disconnect(): Only lock mtw_write if connected and mark noexcept
-- Added '~L2CAPComm() noexcept' for RAII
-- Removed unsued accessors

- GATTHandler
-- Similar treatment as L2CAPComm

- DBTDevice
-- Remove mtx_gatt and its locks, they were not consistent.
   Rely on mtx_connect (connectGATT/getGATTServices/disconnect)
   and atomic local GATTHandler copy when using.

-- disconnect GATTHandler directly in disconnect, remove explicit method.

-- pingGATT uses local gattHandler copy to avoid parallel disconnect nullptr,
   however, it will fail immediately due to disconnection.

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/direct_bt_scanner00/dbt_scanner00.cpp b/examples/direct_bt_scanner00/dbt_scanner00.cpp
index 63eb61c4..5cf9f996 100644
--- a/examples/direct_bt_scanner00/dbt_scanner00.cpp
+++ b/examples/direct_bt_scanner00/dbt_scanner00.cpp
@@ -267,7 +267,7 @@ int main(int argc, char *argv[])
                 }
                 {
                     std::shared_ptr<GATTHandler> gatt = device->getGATTHandler();
-                    if( nullptr != gatt && gatt->isOpen() ) {
+                    if( nullptr != gatt && gatt->getIsConnected() ) {
                         std::shared_ptr<DeviceInformation> di = gatt->getDeviceInformation(primServices);
                         if( nullptr != di ) {
                             fprintf(stderr, "  DeviceInformation: %s\n\n", di->toString().c_str());