gatttool [F8:C3:D1:B0:5A:3A][LE]> connect Attempting to connect to F8:C3:D1:B0:5A:3A Connection successful [F8:C3:D1:B0:5A:3A][LE]> char-write-req 0x0072 0100 Error: Characteristic Write Request failed: Attribute can't be written [F8:C3:D1:B0:5A:3A][LE]> char-write-req 0x0073 0100 Characteristic value was written successfully [F8:C3:D1:B0:5A:3A][LE]> char-write-cmd 0x0072 0100 Notification handle = 0x0072 value: 10 01 81 01 18 63 c2 cc e5 d1 59 41 3b ed 92 c4 b1 63 c2 79 [F8:C3:D1:B0:5A:3A][LE]> ---------- btmon: piggz@adam-laptop ~ $ sudo btmon Bluetooth monitor ver 5.63 = Note: Linux version 5.16.14-1-default (x86_64) 0.393864 = Note: Bluetooth subsystem version 2.22 0.393868 = New Index: DC:53:60:51:00:C6 (Primary,USB,hci0) [hci0] 0.393869 = Open Index: DC:53:60:51:00:C6 [hci0] 0.393869 = Index Info: DC:53:60:51:00:C6 (Intel Corp.) [hci0] 0.393870 @ MGMT Open: bluetoothd (privileged) version 1.21 {0x0001} 0.393871 < HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7 #1 [hci0] 7.719999 Type: Passive (0x00) Interval: 60.000 msec (0x0060) Window: 60.000 msec (0x0060) Own address type: Public (0x00) Filter policy: Accept all advertisement (0x00) > HCI Event: Command Complete (0x0e) plen 4 #2 [hci0] 7.836024 LE Set Scan Parameters (0x08|0x000b) ncmd 1 Status: Success (0x00) < HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #3 [hci0] 7.836096 Scanning: Enabled (0x01) Filter duplicates: Enabled (0x01) > HCI Event: Command Complete (0x0e) plen 4 #4 [hci0] 7.836936 LE Set Scan Enable (0x08|0x000c) ncmd 2 Status: Success (0x00) > HCI Event: LE Meta Event (0x3e) plen 29 #5 [hci0] 7.958973 LE Advertising Report (0x02) Num reports: 1 Event type: Connectable undirected - ADV_IND (0x00) Address type: Random (0x01) Address: 40:73:4D:6C:3A:23 (Resolvable) Data length: 17 Flags: 0x1a LE General Discoverable Mode Simultaneous LE and BR/EDR (Controller) Simultaneous LE and BR/EDR (Host) TX power: 12 dBm Company: Apple, Inc. (76) Type: Unknown (16) Data: 5e1c951fd8 RSSI: -86 dBm (0xaa) > HCI Event: LE Meta Event (0x3e) plen 40 #6 [hci0] 7.981212 LE Advertising Report (0x02) Num reports: 1 Event type: Scannable undirected - ADV_SCAN_IND (0x02) Address type: Random (0x01) Address: 7E:51:8A:D0:C1:B6 (Resolvable) Data length: 28 16-bit Service UUIDs (complete): 1 entry Apple, Inc. (0xfd6f) Service Data (UUID 0xfd6f): 95ae67f112c003bfbc586e9f08b0ecefc93da25b RSSI: -84 dBm (0xac) > HCI Event: LE Meta Event (0x3e) plen 43 #7 [hci0] 8.603059 LE Advertising Report (0x02) Num reports: 1 Event type: Connectable undirected - ADV_IND (0x00) Address type: Random (0x01) Address: F8:C3:D1:B0:5A:3A (Static) Data length: 31 Flags: 0x02 LE General Discoverable Mode Company: Anhui Huami Information Technology Co., Ltd. (343) Data: 02ffffffffffffffffffffffffffffffff03f8c3d1b05a3a RSSI: -53 dBm (0xcb) < HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #8 [hci0] 8.603162 Scanning: Disabled (0x00) Filter duplicates: Disabled (0x00) > HCI Event: Command Complete (0x0e) plen 4 #9 [hci0] 8.610021 LE Set Scan Enable (0x08|0x000c) ncmd 2 Status: Success (0x00) < HCI Command: LE Create Connection (0x08|0x000d) plen 25 #10 [hci0] 8.610082 Scan interval: 60.000 msec (0x0060) Scan window: 60.000 msec (0x0060) Filter policy: Accept list is not used (0x00) Peer address type: Random (0x01) Peer address: F8:C3:D1:B0:5A:3A (Static) Own address type: Public (0x00) Min connection interval: 30.00 msec (0x0018) Max connection interval: 50.00 msec (0x0028) Connection latency: 0 (0x0000) Supervision timeout: 420 msec (0x002a) Min connection length: 0.000 msec (0x0000) Max connection length: 0.000 msec (0x0000) > HCI Event: Command Status (0x0f) plen 4 #11 [hci0] 8.610948 LE Create Connection (0x08|0x000d) ncmd 2 Status: Success (0x00) > HCI Event: LE Meta Event (0x3e) plen 19 #12 [hci0] 9.455186 LE Connection Complete (0x01) Status: Success (0x00) Handle: 3585 Role: Central (0x00) Peer address type: Random (0x01) Peer address: F8:C3:D1:B0:5A:3A (Static) Connection interval: 50.00 msec (0x0028) Connection latency: 0 (0x0000) Supervision timeout: 420 msec (0x002a) Central clock accuracy: 0x00 @ MGMT Event: Device Connected (0x000b) plen 44 {0x0001} [hci0] 9.455262 LE Address: F8:C3:D1:B0:5A:3A (Static) Flags: 0x00000008 Connection Locally Initiated Data length: 31 Flags: 0x02 LE General Discoverable Mode Company: Anhui Huami Information Technology Co., Ltd. (343) Data: 02ffffffffffffffffffffffffffffffff03f8c3d1b05a3a < HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2 #13 [hci0] 9.455478 Handle: 3585 > HCI Event: Command Status (0x0f) plen 4 #14 [hci0] 9.456955 LE Read Remote Used Features (0x08|0x0016) ncmd 1 Status: Success (0x00) > HCI Event: LE Meta Event (0x3e) plen 12 #15 [hci0] 9.504966 LE Read Remote Used Features (0x04) Status: Success (0x00) Handle: 3585 Features: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00 LE Encryption > ACL Data RX: Handle 3585 flags 0x02 dlen 7 #16 [hci0] 9.652964 ATT: Exchange MTU Request (0x02) len 2 Client RX MTU: 247 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 #17 [hci0] 9.653250 ATT: Error Response (0x01) len 4 Exchange MTU Request (0x02) Handle: 0x0000 Error: Request Not Supported (0x06) > HCI Event: Number of Completed Packets (0x13) plen 5 #18 [hci0] 9.704002 Num handles: 1 Handle: 3585 Count: 1 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 #19 [hci0] 12.045092 ATT: Write Request (0x12) len 4 Handle: 0x0072 Data: 0100 > HCI Event: Number of Completed Packets (0x13) plen 5 #20 [hci0] 12.054194 Num handles: 1 Handle: 3585 Count: 1 > ACL Data RX: Handle 3585 flags 0x02 dlen 9 #21 [hci0] 12.102965 ATT: Error Response (0x01) len 4 Write Request (0x12) Handle: 0x0072 Error: Write Not Permitted (0x03) > ACL Data RX: Handle 3585 flags 0x02 dlen 7 #22 [hci0] 12.652941 ATT: Exchange MTU Request (0x02) len 2 Client RX MTU: 247 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 #23 [hci0] 12.653313 ATT: Error Response (0x01) len 4 Exchange MTU Request (0x02) Handle: 0x0000 Error: Request Not Supported (0x06) > HCI Event: Number of Completed Packets (0x13) plen 5 #24 [hci0] 12.704047 Num handles: 1 Handle: 3585 Count: 1 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 #25 [hci0] 15.609948 ATT: Write Request (0x12) len 4 Handle: 0x0073 Data: 0100 > HCI Event: Number of Completed Packets (0x13) plen 5 #26 [hci0] 15.754180 Num handles: 1 Handle: 3585 Count: 1 > ACL Data RX: Handle 3585 flags 0x02 dlen 5 #27 [hci0] 15.803128 ATT: Write Response (0x13) len 0 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 #28 [hci0] 21.310170 ATT: Write Command (0x52) len 4 Handle: 0x0072 Data: 0100 > HCI Event: Number of Completed Packets (0x13) plen 5 #29 [hci0] 21.454029 Num handles: 1 Handle: 3585 Count: 1 > ACL Data RX: Handle 3585 flags 0x02 dlen 27 #30 [hci0] 21.503149 ATT: Handle Value Notification (0x1b) len 22 Handle: 0x0072 Data: 100181011863c2cce5d159413bed92c4b163c279