Paolo Pini Member Licensed User Longtime User Apr 13, 2024 #1 Hi, I have a project that connects my smartphone with a bluetooth device, I need to know when my phone is too far away from the device. I know I can check the RSSI level with: B4X: Copy If admin.LastFoundIntent.HasExtra("android.bluetooth.device.extra.RSSI") Then Dim rssi As Int = admin.LastFoundIntent.GetExtra("android.bluetooth.device.extra.RSSI") Log("RSSI:" & rssi) End If but, if I understand correctly, the RSSI updates at each Admin_DeviceFound() and this only happens after Admin_DiscoveryFinished so to check the RSSI of my device I have to wait for the Admin_DiscoveryFinished cycle to finish and this takes many seconds. I tried using a serial connection to check when the signal is lost, this works fine with my HC-05 but the other device I need (my car) does not accept the serial connection. How can I check the RSSI level of a particular MacAddress continuously or almost every 5-10 seconds. Thanks in advance. Paolo.
Hi, I have a project that connects my smartphone with a bluetooth device, I need to know when my phone is too far away from the device. I know I can check the RSSI level with: B4X: Copy If admin.LastFoundIntent.HasExtra("android.bluetooth.device.extra.RSSI") Then Dim rssi As Int = admin.LastFoundIntent.GetExtra("android.bluetooth.device.extra.RSSI") Log("RSSI:" & rssi) End If but, if I understand correctly, the RSSI updates at each Admin_DeviceFound() and this only happens after Admin_DiscoveryFinished so to check the RSSI of my device I have to wait for the Admin_DiscoveryFinished cycle to finish and this takes many seconds. I tried using a serial connection to check when the signal is lost, this works fine with my HC-05 but the other device I need (my car) does not accept the serial connection. How can I check the RSSI level of a particular MacAddress continuously or almost every 5-10 seconds. Thanks in advance. Paolo.
E emexes Expert Licensed User Longtime User Apr 14, 2024 #2 When you do a Bluetooth scan, the received advertising events include an RSSI number typically -80 to -40. Don't even need to be connected = can monitor presence (and approximate nearness) of multiple devices. Plus saves on transmission energy cost ie battery life (from the phone's perspective). Upvote 0
When you do a Bluetooth scan, the received advertising events include an RSSI number typically -80 to -40. Don't even need to be connected = can monitor presence (and approximate nearness) of multiple devices. Plus saves on transmission energy cost ie battery life (from the phone's perspective).
Paolo Pini Member Licensed User Longtime User Apr 14, 2024 #3 emexes said: When you do a Bluetooth scan, the received advertising events include an RSSI number typically -80 to -40. Don't even need to be connected = can monitor presence (and approximate nearness) of multiple devices. Plus saves on transmission energy cost ie battery life (from the phone's perspective). Click to expand... thank you for your answer. In fact I already do the periodic reading of devices in proximity, the problem is that the update of the RSSI value occurs after 15-20 seconds because the update is carried out when "Admin_DiscoveryFinished()" expires and I wanted to understand if there was a faster way, since I already know the MAC address of the device I want to test. Paolo Upvote 0
emexes said: When you do a Bluetooth scan, the received advertising events include an RSSI number typically -80 to -40. Don't even need to be connected = can monitor presence (and approximate nearness) of multiple devices. Plus saves on transmission energy cost ie battery life (from the phone's perspective). Click to expand... thank you for your answer. In fact I already do the periodic reading of devices in proximity, the problem is that the update of the RSSI value occurs after 15-20 seconds because the update is carried out when "Admin_DiscoveryFinished()" expires and I wanted to understand if there was a faster way, since I already know the MAC address of the device I want to test. Paolo
