Android Question BLE2 Scan SSID

[fbritop]

I'm trying to connect to an ESP32 GATT service.

When I use BLE.Scan(Null) it scans for all services and later in the "DeviceFound" event I filter by the device Name.

I'm trying to restrict the scan with the UUID, but it never founds the device:

    Dim SSID As List
    SSID.Initialize
    SSID.Add("5f6d4f53-5f52-5043-5f53-56435f49445f")
    BLE.Scan2(SSID, True)

I'm sure of the UUID as if I scan with null option, it read´s it, and the UUID is defined clearly here:

GitHub - mongoose-os-libs/rpc-gatts: RPC over GATT, Server

RPC over GATT, Server. Contribute to mongoose-os-libs/rpc-gatts development by creating an account on GitHub.

github.com

Not sure what is the problem around
Thanks in advance

 

[Erel]

More elegant to write:

Dim SSID As List = Array("5f6d4f53-5f52-5043-5f53-56435f49445f")

It is possible that this service is not advertised. The filter will only work with the advertised services.

 

[emexes]

Not sure what is the problem around

You and me both. I've always copied UUIDs from DeviceFound and Connected directly, to make sure that I haven't accidentally got the formatting or letter-casing wrong.

Erel beat me to it, but here's the possibly-relevant BLE2 help with the easy-to-miss clue highlighted ?

 

[fbritop]

Thanks @Erel and @emexes but I pass over that too in the very start. The YML file in the ESP32 is configure to advertise (adv_enable=true):

"bt": {
  "enable": true,             // Enabled by default. Disabled on first reboot with WiFi on
  "dev_name": "",             // Device name. If empty, value equals to device.id
  "adv_enable": true,         // Advertise our Bluetooth services
  "keep_enabled": true,       // Keep enabled after successful boot with WiFi on
  "scan_rsp_data_hex": "",    // Custom scan response data, as hex string (e.g. `48656c6c6f` for `Hello`)
  "allow_pairing": true,      // Allow pairingbonding with other devices
  "max_paired_devices": 10,   // Allow pairing with up to this many devices; -1 - no limit
  "gatts": {
    "min_sec_level": 0,       // Minimum security level for all attributes of all services.
                              // 0 - no auth required, 1 - encryption reqd, 2 - encryption + MITM reqd
    "require_pairing": false  // Require taht device is paired before accessing services
  }
}

More over, when I see the logs, it starts advertising:

 

[DonManfred]

it starts advertising

but it does not prints WHAT it advertising. I mean which service guid(s).
The Service GUID you are trying is probably not advertised.

 

[emexes]

Does the UUID show up with:

Sub Manager_Connected(Services As List)
    
    For Each S As String In Services
        Log("[" & S & "]")
    Next
    
End Sub

 

[fbritop]

Does the UUID show up with:

Sub Manager_Connected(Services As List)
   
    For Each S As String In Services
        Log("[" & S & "]")
    Next
   
End Sub

@emexes yes, it outputs the exact service I´m seeking: 5f6d4f53-5f43-4647-5f53-56435f49445f. I have also tried upper and lower case (as you see in iOS/Android is diferent, also the status returns are diferent). Anyway the systems works with scanning all devices. It´s just a matter of being more efficient if there are too many BLE Devices arround

 

[Erel]

I'm not 100% sure that this is indeed the problem but the fact that you see the service after connecting doesn't mean that the service is advertised.

 

[fbritop]

I will wait for an answer from Mongoose OS regarding this. Keep posted when I receive more info from them

Thanks