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I added -E to bluetoothd command to enable experimental mode:

Loaded code from storage.
serviceworker> active
Handling URL "https://www.espruino.com/ide/"
Couldn't connect to wss://localhost:31234 - disabling websockets for this session
ERROR: getURL("/serial/ports") error : Not Found
/serial/ports doesn't exist - disabling WebSocket support
ERROR: serial_frame: getPorts timeout, disabling
>>> Connecting...
Set Slow Write = true
>>> Connecting to Pixl.js c734
BT>  Device Name:       Pixl.js c734
BT>  Device ID:         MckzoCJ/zg3Wdi0vtHM5mg==
>>> Connected to BLE
BT> Connected
BT> Disconnected (gattserverdisconnected)
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.
BT> ERROR: NetworkError: GATT Server is disconnected. Cannot retrieve services. (Re)connect first with `device.gatt.connect`.

Well, i try using my little laptop, still on ubuntu 19.04, and while i didnt face same issue, i still encounter new one :

Loaded code from storage.
Handling URL "https://www.espruino.com/ide/"
Couldn't connect to wss://localhost:31234 - disabling websockets for this session
ERROR: getURL("/serial/ports") error : Not Found
/serial/ports doesn't exist - disabling WebSocket support
ERROR: serial_frame: getPorts timeout, disabling
>>> Connecting...
Set Slow Write = true
serviceworker> active
BT> ERROR: NotFoundError: User cancelled the requestDevice() chooser.
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.
>>> Connecting...
Set Slow Write = true
>>> Connecting to Pixl.js c734
BT>  Device Name:       Pixl.js c734
BT>  Device ID:         MckzoCJ/zg3Wdi0vtHM5mg==
BT> ERROR: NetworkError: Connection failed for unknown reason.
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.

thank you @Gordon :)

And there we go :

plonky@macronetmonk:~/node_modules/espruino/bin$ ./espruino-cli.js -d Pixl --ide 8080
Espruino Command-line Tool 0.1.27
-----------------------------------

Searching for device named "Pixl"
Found "Pixl.js c734" ("fa:ee:05:a7:c7:34")
Connecting to 'fa:ee:05:a7:c7:34'
Connected
Web IDE is now available on http://localhost:8080
Web IDE Connection accepted.

>< << {"VERSION":"2v01","GIT_COMMIT":"748a4d3","BOARD":"PIXLJS","FLASH":524288,"RAM":65536,"SERIAL":"1e21d7bf-3480018d","CONSOLE":"Bluetooth","MODULES":"Flash,Storage,heatshrink,fs,net,dgram,http,NetworkJS,WIZnet,crypto,neopixel,graphical_menu","EXPTR":536882356} >> >
>

plonky@macronetmonk:~/node_modules/espruino/bin$ sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)
[sudo] password for plonky: 
plonky@macronetmonk:~/node_modules/espruino/bin$ ./espruino-cli.js --list
Espruino Command-line Tool 0.1.27
-----------------------------------

PORTS:
  fa:ee:05:a7:c7:34 (Pixl.js c734)
plonky@macronetmonk:~/node_modules/espruino/bin$ ./espruino-cli.js --list --verbose
0.1.27
Espruino Command-line Tool 0.1.27
-----------------------------------

Acorn library not found - you'll need it for compiled code
Found /home/plonky/node_modules/espruino/libs/targz.js
Found /home/plonky/node_modules/espruino/libs/utf8.js
Found /home/plonky/node_modules/espruino/espruino.js
Found /home/plonky/node_modules/espruino/core/codeWriter.js
Found /home/plonky/node_modules/espruino/core/config.js
Found /home/plonky/node_modules/espruino/core/env.js
Found /home/plonky/node_modules/espruino/core/flasher.js
Found /home/plonky/node_modules/espruino/core/modules.js
Found /home/plonky/node_modules/espruino/core/notifications.js
Found /home/plonky/node_modules/espruino/core/serial.js
Found /home/plonky/node_modules/espruino/core/serial_chrome_serial.js
No chrome.serial - Chrome Serial disabled
Found /home/plonky/node_modules/espruino/core/serial_chrome_socket.js
No chrome.sockets - Chrome Socket disabled
Found /home/plonky/node_modules/espruino/core/serial_frame.js
Found /home/plonky/node_modules/espruino/core/serial_noble.js
Found /home/plonky/node_modules/espruino/core/serial_node_serial.js
Found /home/plonky/node_modules/espruino/core/serial_node_socket.js
Found /home/plonky/node_modules/espruino/core/serial_web_audio.js
Found /home/plonky/node_modules/espruino/core/serial_web_bluetooth.js
Found /home/plonky/node_modules/espruino/core/serial_websocket_local.js
Found /home/plonky/node_modules/espruino/core/serial_websocket_relay.js
Found /home/plonky/node_modules/espruino/core/serial_winnus.js
Not on Windows, Winnus not needed
Found /home/plonky/node_modules/espruino/core/terminal.js
Found /home/plonky/node_modules/espruino/core/utils.js
Found /home/plonky/node_modules/espruino/plugins/assembler.js
Found /home/plonky/node_modules/espruino/plugins/boardJSON.js
Found /home/plonky/node_modules/espruino/plugins/compiler.js
Found /home/plonky/node_modules/espruino/plugins/getGitHub.js
Found /home/plonky/node_modules/espruino/plugins/localModules.js
Found /home/plonky/node_modules/espruino/plugins/minify.js
Found /home/plonky/node_modules/espruino/plugins/saveOnSend.js
Found /home/plonky/node_modules/espruino/plugins/setTime.js
Found /home/plonky/node_modules/espruino/plugins/unicode.js
Loading UTF8 with require
Found /home/plonky/node_modules/espruino/plugins/versionChecker.js
Initialising CodeWriter
Initialising Config
Initialising Env
Initialising Flasher
Initialising Modules
Initialising Notifications
Initialising Serial
  - Initialising Serial Noble Bluetooth LE
  - Initialising Serial Node Serial
  - Initialising Serial Node Socket
  - Initialising Serial Web Bluetooth
Initialising Utils
Initialising Status
Initialising Assembler
Initialising BoardJSON
Initialising Compiler
Initialising GetGitHub
Initialising LocalModules
Initialising Minify
Initialising SaveOnSend
Initialising SetTime
Initialising Unicode
Initialising VersionChecker
Initialising CoreModules
Searching for serial ports...
Noble: getPorts - not initialised
No navigator.bluetooth - Web Bluetooth not enabled
Noble: stateChange -> poweredOn
Noble: Disable Web Bluetooth as we have Noble instead
Noble: Starting scan
Noble: Found UART device: Pixl.js c734 fa:ee:05:a7:c7:34
Noble: Found device: TNT_BW   f0:ab:54:4b:3f:8c
Noble: Found device: TNT_BW   f0:ab:54:4b:3f:8c
PORTS:
  fa:ee:05:a7:c7:34 (Pixl.js c734)

looks better ! :)

Well well well,
Not good.
As far as i can see:

plonky@macronetmonk:~/node_modules/espruino/bin$ ./espruino-cli.js --list
Espruino Command-line Tool 0.1.27
-----------------------------------

PORTS:

No port listed.
I can still connect using gatttool, but using a random address on computer side.
If i use a public address, it doesn't work at all:

plonky@macronetmonk:~/node_modules/espruino/bin$ gatttool -t random -b FA:EE:05:A7:C7:34 -I
[FA:EE:05:A7:C7:34][LE]> connect
Attempting to connect to FA:EE:05:A7:C7:34
Connection successful
Notification handle = 0x000d value: 3c 2d 20 54 65 72 6d 69 6e 61 6c 0d 0a 3e 
[FA:EE:05:A7:C7:34][LE]> 

(gatttool:18294): GLib-WARNING **: 17:06:47.993: Invalid file descriptor.
plonky@macronetmonk:~/node_modules/espruino/bin$ man gatttool
plonky@macronetmonk:~/node_modules/espruino/bin$ gatttool -t public -b FA:EE:05:A7:C7:34 -I
[FA:EE:05:A7:C7:34][LE]> connect
Attempting to connect to FA:EE:05:A7:C7:34
[FA:EE:05:A7:C7:34][LE]> 
plonky@macronetmonk:~/node_modules/espruino/bin$

Good monring Gordon,

I will receive an external dongle by end of week to make more test.
I will also try the NPM way you suggest and keep you informed. :)

Thank you so much for your answers.

plonky@macronetmonk:~$ sudo hcitool lescan
[sudo] password for plonky: 
LE Scan ...
FA:EE:05:A7:C7:34 Pixl.js c734
FA:EE:05:A7:C7:34 (unknown)
F0:AB:54:4B:3F:8C TNT_BW  
F0:AB:54:4B:3F:8C (unknown)

plonky@macronetmonk:~$ bluetoothd --version
5.50
plonky@macronetmonk:~$ sudo /etc/init.d/bluetooth restart
[sudo] password for plonky: 
[ ok ] Restarting bluetooth (via systemctl): bluetooth.service.
plonky@macronetmonk:~$ chromium --version
Chromium 74.0.3729.108 snap

Still getting the error :

serviceworker> active
Handling URL "https://www.espruino.com/ide/"
Couldn't connect to wss://localhost:31234 - disabling websockets for this session
ERROR: serial_frame: getPorts timeout, disabling
ERROR: getURL("/serial/ports") error : Not Found
/serial/ports doesn't exist - disabling WebSocket support
>>> Connecting...
Set Slow Write = true
BT> ERROR: NotFoundError: Bluetooth adapter not available.
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.
>>> Connecting...
Set Slow Write = true
BT> ERROR: NotFoundError: Bluetooth adapter not available.
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.

After activating bluetooth in chrome with enabling this switch :
chrome://flags/#enable-experimental-web-platform-features
i face a new issue :

serviceworker> active
Handling URL "https://www.espruino.com/ide/"
Couldn't connect to wss://localhost:31234 - disabling websockets for this session
ERROR: serial_frame: getPorts timeout, disabling
ERROR: getURL("/serial/ports") error : Not Found
/serial/ports doesn't exist - disabling WebSocket support
>>> Connecting...
Set Slow Write = true
BT> ERROR: NotFoundError: Bluetooth adapter not available.
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.

Good evening,
Im able to connect to device using gatttool command

root@macronetmonk:/var/log# gatttool -t random -b FA:EE:05:A7:C7:34 -I
[FA:EE:05:A7:C7:34][LE]> connect Attempting to connect to
FA:EE:05:A7:C7:34 Connection successful
[FA:EE:05:A7:C7:34][LE]> help

But im unable to connect to it using web ide app from chromium, the device is not appearing when i try to connect.
It works very well from the same computer station, when im using windows10, i succed to connect and dev with windows chrome. But when i switch back to ubuntu (latest version 19.*) not possible to connect.

anybody had faced this issue before, and how did you solved it ?