On Wed, May 03, 2017 at 12:10:28PM -0700, Christopher Collins wrote: > On Wed, May 03, 2017 at 10:59:59AM -0700, Pritish Gandhi wrote: > > Hi All, > > Just wanted to give an update to the community on the status of trying to > > start the GATT server after the OS is initialized. > > > > to ble_hs.c > > @@ -606,5 +603,7 @@ ble_hs_init(void) > > /* Configure the HCI transport to communicate with a host. */ > > ble_hci_trans_cfg_hs(ble_hs_hci_rx_evt, NULL, ble_hs_rx_data, NULL); > > > > +#if 0 /* Let the Application set the queue and start the BLE stack */ > > ble_hs_evq_set(os_eventq_dflt_get()); > > +#endif > > } > > Is there a particular reason you removed the call to ble_hs_evq_set(), > rather than the call to ble_hs_start()? I think it is preferable to > keep ble_hs_evq_set() here, and just hold off on starting the host. If > some other package tries to use the host before its eventq is set, it > will result in a null pointer dereference. > > > Then, I just have to call ble_hs_evq_set() with my ble thread's queue after > > registering my GATT services. > > > > The next thing I need to figure out though, is how to remove registered > > GATT services and add new ones after the GATT server has started. > > I think ble_hs_sched_reset() might work, if I move its function definition > > from src/ble_hs_priv.h to include/ble_hs.h. > > I haven't tried this out yet though. Will get to it soon. > > Unfortunately, I don't think ble_hs_sched_reset() will work here. That > function just resets the controller and connection / procedure lists, > but it does not have any effect on the registered GATT services.] > > I haven't tried it, but I think the following sequence should do the > trick: > > 1. Register your new services with ble_gatts_add_svcs(). > 2. Call ble_gatts_start() > > ble_gatts_start() should already get called at startup as soon as the > host starts. When this happens, the registered services get exposed to > BLE peers, and the "working set" of services is cleared. This is why > you can just start adding new services in step 1; the working set has > been cleared, so you are starting from scratch. When you call > ble_gatts_start() in step 2, the previously-exported services get > replaced with the new ones.
Actually, there is one more thing that you'll need to do here: set ble_gatts_num_cfgable_chrs to 0. This is a static variable, so you'll need to hack the code a bit to get access to it. So the sequence should be: 1. ble_gatts_num_cfgable_chrs = 0; 2. Register your new services with ble_gatts_add_svcs(). 3. Call ble_gatts_start() Without this step, the GATT server will try to allocate too many CCCD entries, which could cause the ble_gatts_start() call to fail. Chris
