bluetooth disconnected just after connected on ubuntu 20.04 - bluetooth

Question

i'm trying to make my own photobooth using instant photo printer which uses bluetooth and dye sublimation type. For doing that, BT connection needs to be implemented in the python or node js code. Basically, i'm planing just utilize the system command.
for now, however, having tested Polaroid Hi-print and Kodak P300R, but none of these are not even connected. in specifically, it disconnected by remote user(device) just after connected.(Actually, they only supports for mobile platforms like android or iOS)
now even I'm confusing it's possible. Could you guys help me to get through with?
Here's are the btmon logs of connection using "hcitool cc [btaddr]" ..
# RAW Open: hcitool (privileged) version 2.22 {0x0002} 3407.844746
# RAW Close: hcitool {0x0002} 3407.844761
# RAW Open: hcitool (privileged) version 2.22 {0x0002} [hci0] 3407.844771
< HCI Command: Create Connection (0x01|0x0005) plen 13 #196 [hci0] 3407.844787
Address: 00:15:83:41:DB:94 (IVT corporation)
Packet type: 0xcc18
DM1 may be used
DH1 may be used
DM3 may be used
DH3 may be used
DM5 may be used
DH5 may be used
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
Role switch: Allow slave (0x01)
> HCI Event: Command Status (0x0f) plen 4 #197 [hci0] 3407.982359
Create Connection (0x01|0x0005) ncmd 2
Status: Success (0x00)
> HCI Event: Role Change (0x12) plen 8 #198 [hci0] 3408.627344
Status: Success (0x00)
Address: 00:15:83:41:DB:94 (IVT corporation)
Role: Slave (0x01)
> HCI Event: Connect Complete (0x03) plen 11 #199 [hci0] 3408.633340
Status: Success (0x00)
Handle: 3
Address: 00:15:83:41:DB:94 (IVT corporation)
Link type: ACL (0x01)
Encryption: Disabled (0x00)
# RAW Close: hcitool {0x0002} [hci0] 3408.633412
< HCI Command: Read Remote Supp.. (0x01|0x001b) plen 2 #200 [hci0] 3408.633427
Handle: 3
> HCI Event: Command Status (0x0f) plen 4 #201 [hci0] 3408.637320
Read Remote Supported Features (0x01|0x001b) ncmd 2
Status: Success (0x00)
> HCI Event: Max Slots Change (0x1b) plen 3 #202 [hci0] 3408.638316
Handle: 3
Max slots: 5
> HCI Event: Max Slots Change (0x1b) plen 3 #203 [hci0] 3408.644343
Handle: 3
Max slots: 5
> HCI Event: Read Remote Supported Fe.. (0x0b) plen 11 #204 [hci0] 3408.646313
Status: Success (0x00)
Handle: 3
Features: 0xff 0xff 0xc9 0xfa 0x83 0xa7 0x79 0x87
3 slot packets
5 slot packets
Encryption
Slot offset
Timing accuracy
Role switch
Hold mode
Sniff mode
Park state
Power control requests
Channel quality driven data rate (CQDDR)
SCO link
HV2 packets
HV3 packets
u-law log synchronous data
A-law log synchronous data
CVSD synchronous data
Transparent synchronous data
Flow control lag (most significant bit)
Broadcast Encryption
Enhanced Data Rate ACL 2 Mbps mode
Enhanced inquiry scan
Interlaced inquiry scan
Interlaced page scan
RSSI with inquiry results
Extended SCO link (EV3 packets)
EV4 packets
EV5 packets
3-slot Enhanced Data Rate ACL packets
5-slot Enhanced Data Rate ACL packets
Sniff subrating
Pause encryption
Enhanced Data Rate eSCO 2 Mbps mode
3-slot Enhanced Data Rate eSCO packets
Extended Inquiry Response
Secure Simple Pairing
Encapsulated PDU
Erroneous Data Reporting
Non-flushable Packet Boundary Flag
Link Supervision Timeout Changed Event
Inquiry TX Power Level
Enhanced Power Control
Extended features
< HCI Command: Read Remote Exte.. (0x01|0x001c) plen 3 #205 [hci0] 3408.646327
Handle: 3
Page: 1
> HCI Event: Command Status (0x0f) plen 4 #206 [hci0] 3408.647314
Read Remote Extended Features (0x01|0x001c) ncmd 2
Status: Success (0x00)
> HCI Event: Read Remote Extended Fea.. (0x23) plen 13 #207 [hci0] 3408.678320
Status: Success (0x00)
Handle: 3
Page: 1/1
Features: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Secure Simple Pairing (Host Support)
< HCI Command: Remote Name Req.. (0x01|0x0019) plen 10 #208 [hci0] 3408.678378
Address: 00:15:83:41:DB:94 (IVT corporation)
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
< ACL Data TX: Handle 3 flags 0x00 dlen 10 #209 [hci0] 3408.678386
L2CAP: Information Request (0x0a) ident 1 len 2
Type: Extended features supported (0x0002)
> HCI Event: Command Status (0x0f) plen 4 #210 [hci0] 3408.680339
Remote Name Request (0x01|0x0019) ncmd 2
Status: Success (0x00)
> HCI Event: Number of Completed Packets (0x13) plen 5 #211 [hci0] 3408.706320
Num handles: 1
Handle: 3
Count: 1
> ACL Data RX: Handle 3 flags 0x02 dlen 16 #212 [hci0] 3408.708440
L2CAP: Information Response (0x0b) ident 1 len 8
Type: Extended features supported (0x0002)
Result: Success (0x0000)
Features: 0x00000080
Fixed Channels
< ACL Data TX: Handle 3 flags 0x00 dlen 10 #213 [hci0] 3408.708483
L2CAP: Information Request (0x0a) ident 2 len 2
Type: Fixed channels supported (0x0003)
> HCI Event: Number of Completed Packets (0x13) plen 5 #214 [hci0] 3408.712315
Num handles: 1
Handle: 3
Count: 1
> ACL Data RX: Handle 3 flags 0x02 dlen 20 #215 [hci0] 3408.714439
L2CAP: Information Response (0x0b) ident 2 len 12
Type: Fixed channels supported (0x0003)
Result: Success (0x0000)
Channels: 0x0000000000000002
L2CAP Signaling (BR/EDR)
> HCI Event: Remote Name Req Complete (0x07) plen 255 #216 [hci0] 3408.733311
Status: Success (0x00)
Address: 00:15:83:41:DB:94 (IVT corporation)
Name: Hi-Print 2×3 - DB94
# MGMT Event: Device Connected (0x000b) plen 35 {0x0003} [hci0] 3408.733351
BR/EDR Address: 00:15:83:41:DB:94 (IVT corporation)
Flags: 0x00000000
Data length: 22
Name (complete): Hi-Print 2×3 - DB94
# MGMT Event: Device Connected (0x000b) plen 35 {0x0001} [hci0] 3408.733351
BR/EDR Address: 00:15:83:41:DB:94 (IVT corporation)
Flags: 0x00000000
Data length: 22
Name (complete): Hi-Print 2×3 - DB94
< HCI Command: Disconnect (0x01|0x0006) plen 3 #217 [hci0] 3410.692257
Handle: 3
Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4 #218 [hci0] 3410.693261
Disconnect (0x01|0x0006) ncmd 2
Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4 #219 [hci0] 3410.790256
Status: Success (0x00)
Handle: 3
Reason: Connection Terminated By Local Host (0x16)
# MGMT Event: Device Disconnected (0x000c) plen 8 {0x0003} [hci0] 3410.790295
BR/EDR Address: 00:15:83:41:DB:94 (IVT corporation)
Reason: Connection terminated by local host (0x02)
# MGMT Event: Device Disconnected (0x000c) plen 8 {0x0001} [hci0] 3410.790295
BR/EDR Address: 00:15:83:41:DB:94 (IVT corporation)
Reason: Connection terminated by local host (0x02)

Answer 1

Removing the device (previously paired) and remove from the list.
Then do fresh connection it will work.