Hi, Den mån 26 juli 2021 kl 18:19 skrev Peter Höller <drmedvet.hoeller@xxxxxxxxx>: > > Hi Emil! > > Thanks for your input!! > > I do have to stabilze this connection, I do not have any other chance, > unfortunately. > > What I fell in my guts right now is that most likely: > this >>>> > 2. The peripheral could use white listing to allow connections from > only specific centrals. In this case the central will always see a > connection complete immediately followed by a connection failed to be > established. > >>>>> > > and this>>>>> > If the peripheral > responds at least once, but after that at any time it doesn't respond > to a central's packet within the set supervision timeout, the > "Connection Timeout" disconnect reason will happen. > >>>>> > > plays a role in my issue!! > > However , just to be mentioned, I cannot set (or prolong) supervision > timeout period, which was my intention initially. > > here is what I am able to read/set (sudo nano) under: > root@odroid:/sys/kernel/debug/bluetooth/hci0# > > 6lowpan force_sc_support random_address > adv_channel_map force_static_address rpa_timeout > auto_accept_delay hci_revision sc_only_mode > blacklist hci_version sniff_max_interval > conn_info_max_age identity sniff_min_interval > conn_info_min_age identity_resolving_keys ssp_debug_mode > conn_max_interval idle_timeout static_address > conn_min_interval inquiry_cache uuids > dev_class le_auto_conn voice_setting > discov_interleaved_timeout link_keys white_list > dut_mode long_term_keys white_list_size > features manufacturer > > Do you have any suggestions for those parameters or am I tuning on the > wrong place here? > > However, I am going for wireshark fur ubuntu now, if I understood you right? > > with kind regards > > Peter Someone else should reply to the question about modifying the supervision timeout. I think BlueZ hardcodes it but I might be wrong. Either way you could always locate the code for it and recompile with new parameters. For a BLE sniffer you could for example use an nRF52 devkit, flash the sniffer firmware at https://www.nordicsemi.com/Products/Development-tools/nrf-sniffer-for-bluetooth-le and then use Wireshark to analyze the traffic in real time. /Emil
