My setup is as follows:
When I connect to the Raspberry Pi using nRF tool, it connects successfully. But, when I connect using my own Android App it fails.
In the Raspberry Pi, I ran sudo btmon command to examine the failure log which is shown below:
> HCI Event: Connect Request (0x04) plen 10 [hci0] 143.774717
Address: 88:A3:03:E7:18:EA (OUI 88-A3-03)
Class: 0x5a020c
Major class: Phone (cellular, cordless, payphone, modem)
Minor class: Smart phone
Networking (LAN, Ad hoc)
Capturing (Scanner, Microphone)
Object Transfer (v-Inbox, v-Folder)
Telephony (Cordless telephony, Modem, Headset)
Link type: ACL (0x01)
< HCI Command: Reject Connection Request (0x01|0x000a) plen 7 [hci0] 143.774802
Address: 88:A3:03:E7:18:EA (OUI 88-A3-03)
Reason: Connection Rejected due to Unacceptable BD_ADDR (0x0f)
> HCI Event: Command Status (0x0f) plen 4 [hci0] 143.775814
Reject Connection Request (0x01|0x000a) ncmd 1
Status: Success (0x00)
> HCI Event: Connect Complete (0x03) plen 11 [hci0] 143.897643
Status: Connection Rejected due to Unacceptable BD_ADDR (0x0f)
Handle: 0
Address: 88:A3:03:E7:18:EA (OUI 88-A3-03)
Link type: ACL (0x01)
Encryption: Disabled (0x00)
The error as shown in the log is due to BD_ADDR. When using nRF tool the bd_addr is
Peer address type: Random (0x01)
Peer address: 58:B2:55:17:1A:92 (Resolvable)
Something weird that I cannot understand: Once I bond to the Raspberry Pi using nRF tool and then try to connect to the Raspberry Pi from my app, it connects.
How can I solve this issue?
Your event log shows that you're connecting using Bluetooth Classic. If you want to use BLE, use a connectGatt variant where you can select LE as transport parameter.