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I could not find the ameriDroid on UK market, I have bought an other one different BT dongle and the issue persist. Could be the error platform depended? I don't use R pi. Is the error caused definitely by BT dongle?
Any suggestions what can I test/check/try to fix it please?

No luck, still the same issue. I have got Plugable BLE adapter
I can get an other one, could you recommend some which would work please.

I have just mended mqtt subscription to "/ble/write/c9:a2:6b:fd:3f:9d/nus/nus_tx"
Still receiving error unfortunately:
MQTT>/ble/write/c9:a2:6b:fd:3f:9d/nus/nus_tx => "LED1.set();\n"
Service 6e400001b5a3f393e0a9e50e24dcca9e
Characteristic 6e400002b5a3f393e0a9e50e24dcca9e
Error Connecting: Error: Command Disallowed

I can receive the advertise and rssi thou.

Hi
I have updated all npm packages, git pull EsprinoHub and tryied installed it again. I got error:

usb@1.2.0 install /root/EspruinoHub/node_modules/usb
> node-pre-gyp install --fallback-to-build

node-pre-gyp ERR! Tried to download: https://github.com/tessel/node-usb/releases/download/1.2.0/usb_bindings-v1.2.0-node-v47-linux-arm.tar.gz 
node-pre-gyp ERR! Pre-built binaries not found for usb@1.2.0 and node@5.12.0 (node-v47 ABI) (falling back to source compile with node-gyp) 
make: Entering directory '/root/EspruinoHub/node_modules/usb/build'
  CC(target) Release/obj.target/libusb/libusb/libusb/core.o
  CC(target) Release/obj.target/libusb/libusb/libusb/descriptor.o
  CC(target) Release/obj.target/libusb/libusb/libusb/hotplug.o
  CC(target) Release/obj.target/libusb/libusb/libusb/io.o
  CC(target) Release/obj.target/libusb/libusb/libusb/strerror.o
  CC(target) Release/obj.target/libusb/libusb/libusb/sync.o
  CC(target) Release/obj.target/libusb/libusb/libusb/os/poll_posix.o
  CC(target) Release/obj.target/libusb/libusb/libusb/os/threads_posix.o
  CC(target) Release/obj.target/libusb/libusb/libusb/os/linux_usbfs.o
  CC(target) Release/obj.target/libusb/libusb/libusb/os/linux_udev.o
../libusb/libusb/os/linux_udev.c:40:21: fatal error: libudev.h: No such file or directory
 [#include](https://forum.espruino.com/search/?q=%23include) <libudev.h>
                     ^
compilation terminated.
libusb.target.mk:131: recipe for target 'Release/obj.target/libusb/libusb/libusb/os/linux_udev.o' failed
make: *** [Release/obj.target/libusb/libusb/libusb/os/linux_udev.o] Error 1
make: Leaving directory '/root/EspruinoHub/node_modules/usb/build'
gyp ERR! build error 
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:276:23)
gyp ERR! stack     at emitTwo (events.js:100:13)
gyp ERR! stack     at ChildProcess.emit (events.js:185:7)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:204:12)
gyp ERR! System Linux 4.8.4-sunxi
gyp ERR! command "/usr/bin/nodejs" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "build" "--fallback-to-build" "--module=/root/EspruinoHub/node_modules/usb/src/binding/usb_bindings.node" "--module_name=usb_bindings" "--module_path=/root/EspruinoHub/node_modules/usb/src/binding"
gyp ERR! cwd /root/EspruinoHub/node_modules/usb
gyp ERR! node -v v5.12.0
gyp ERR! node-gyp -v v3.4.0
gyp ERR! not ok 
node-pre-gyp ERR! build error 
node-pre-gyp ERR! stack Error: Failed to execute '/usr/bin/nodejs /usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build --fallback-to-build --module=/root/EspruinoHub/node_modules/usb/src/binding/usb_bindings.node --module_name=usb_bindings --module_path=/root/EspruinoHub/node_modules/usb/src/binding' (1)
node-pre-gyp ERR! stack     at ChildProcess.<anonymous> (/root/EspruinoHub/node_modules/usb/node_modules/node-pre-gyp/lib/util/compile.js:83:29)
node-pre-gyp ERR! stack     at emitTwo (events.js:100:13)
node-pre-gyp ERR! stack     at ChildProcess.emit (events.js:185:7)
node-pre-gyp ERR! stack     at maybeClose (internal/child_process.js:850:16)
node-pre-gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:215:5)
node-pre-gyp ERR! System Linux 4.8.4-sunxi
node-pre-gyp ERR! command "/usr/bin/nodejs" "/root/EspruinoHub/node_modules/usb/node_modules/.bin/node-pre-gyp" "install" "--fallback-to-build"
node-pre-gyp ERR! cwd /root/EspruinoHub/node_modules/usb
node-pre-gyp ERR! node -v v5.12.0
node-pre-gyp ERR! node-pre-gyp -v v0.6.30
node-pre-gyp ERR! not ok 
Failed to execute '/usr/bin/nodejs /usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js build --fallback-to-build --module=/root/EspruinoHub/node_modules/usb/src/binding/usb_bindings.node --module_name=usb_bindings --module_path=/root/EspruinoHub/node_modules/usb/src/binding' (1)
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: xpc-connection@~0.1.4 (node_modules/bleno/node_modules/xpc-connection):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for xpc-connection@0.1.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: xpc-connection@~0.1.4 (node_modules/noble/node_modules/xpc-connection):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for xpc-connection@0.1.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm"})
npm WARN EspruinoHub@0.0.0 No repository field.
npm WARN EspruinoHub@0.0.0 license should be a valid SPDX license expression
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: usb@1.2.0 (node_modules/usb):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: usb@1.2.0 install: `node-pre-gyp install --fallback-to-build`
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1

IT looks like the EspruinoHub is not installed properly.
I use Olimex A20 platform with Armbian.
Any suggestions please?

Hello
Amazing! the button works fine. Thank you very much.
I'm trying to get some feedback information back to puck, like LED.
When I send: /ble/write/e7:e0:57:ad:36:a2/nus/nus_tx (with my address obviously) I get en error:

MQTT>/ble/write/c9:a2:6b:fd:3f:9d/nus/nus_tx => "LED1.set();\n"
Service 6e400001b5a3f393e0a9e50e24dcca9e Characteristic nus_tx
Error Connecting: Error: Command Disallowed

Any clue what is wrong please?

I have managed to run the mqtt example from: espruino.com/Puck.js+Node-RE­D
I can receive the advertise and rssi. Now I'm trying to send a MQTT message when the button is pressed.
Any suggestions, examples please?