I want to link microbit and node-red with bluetooth and get sensor data with node-red, but I can only connect, but I can't read sensor data. The node used is node-red-contrib-generic-ble.
I am not familiar with bluetooth. The settings on the microbit side are not well understood.
For example, if you press the A button on the microbit, I want to do something like 1 appears in the node-red debug.
Thank you very much.
Seems the microbit supports GATT services. Besides, you have to activate Button Service somehow:
Button Service Custom optional Allow button state changes to be notified to the client
https://lancaster-university.github.io/microbit-docs/ble/profile/#gatt-services
Have you tried some of the other node & solutions discussed here?
I asked the question over on twitter (as that's where I know some microbit people) and best answer so far is only over USB serial
using
Your question has taken me down a very large rabbit hole 
If you run this makecode on your microbit
ensuring no paring is set
then connect an android phone using app - nRF connect for mobile
scan and find your microbit
scrolldown to microbit button service - select it and press the 3 down arrows next to button A State
then click on the microbit button A and you should see the it update status on the phone
Now "all" we need to do is work out what message the android app sends to the microbit to enable the notifications and send the same message from Node-RED
EUREKA!!!
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I've made this cleaner and easier to use thanks to help from @afelix
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/[a-f0-9]{32}/}))","propertyType":"jsonata","rules":[{"t":"eq","v":"e95dda90251d470aa062fa1922dfa9a8","vt":"str"},{"t":"eq","v":"e95dda91251d470aa062fa1922dfa9a8","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":510,"y":120,"wires":[["5493f10.0edff1"],["af6ef78e.cc3d28"]]},{"id":"e42aac6.8060e5","type":"debug","z":"3d21c343.43135c","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","x":930,"y":80,"wires":[]},{"id":"5493f10.0edff1","type":"change","z":"3d21c343.43135c","name":"ButtonA","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.characteristics.$sift(function($val,$key) {$key ~> /[a-f0-9]{32}/}).*","tot":"jsonata"},{"t":"set","p":"payload","pt":"msg","to":"payload[0]","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":700,"y":80,"wires":[["e42aac6.8060e5"]]},{"id":"af6ef78e.cc3d28","type":"change","z":"3d21c343.43135c","name":"ButtonB","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.characteristics.$sift(function($val,$key) {$key ~> /[a-f0-9]{32}/}).*","tot":"jsonata"},{"t":"set","p":"payload","pt":"msg","to":"payload[0]","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":700,"y":140,"wires":[["bcbaed84.16fb5"]]},{"id":"bcbaed84.16fb5","type":"debug","z":"3d21c343.43135c","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","x":930,"y":140,"wires":[]},{"id":"52932639.b8fa68","type":"Generic BLE","z":"","localName":"BBC micro:bit [tiguv]","address":"e5:a8:1e:1c:cd:5c","uuid":"e5a81e1ccd5c","muteNotifyEvents":false,"operationTimeout":"","characteristics":[{"uuid":"2a00","name":"Device Name","type":"org.bluetooth.characteristic.gap.device_name","notifiable":false,"readable":true,"writable":true,"writeWithoutResponse":false},{"uuid":"2a01","name":"Appearance","type":"org.bluetooth.characteristic.gap.appearance","notifiable":false,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"2a04","name":"Peripheral Preferred Connection Parameters","type":"org.bluetooth.characteristic.gap.peripheral_preferred_connection_parameters","notifiable":false,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"2a05","name":"Service Changed","type":"org.bluetooth.characteristic.gatt.service_changed","notifiable":false,"readable":false,"writable":false,"writeWithoutResponse":false},{"uuid":"e95d93b1251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":false,"readable":true,"writable":true,"writeWithoutResponse":false},{"uuid":"e97d3b10251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":true,"readable":false,"writable":false,"writeWithoutResponse":true},{"uuid":"2a24","name":"Model Number String","type":"org.bluetooth.characteristic.model_number_string","notifiable":false,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"2a25","name":"Serial Number String","type":"org.bluetooth.characteristic.serial_number_string","notifiable":false,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"2a26","name":"Firmware Revision String","type":"org.bluetooth.characteristic.firmware_revision_string","notifiable":false,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"e95d9775251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":true,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"e95d5404251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":false,"readable":false,"writable":true,"writeWithoutResponse":true},{"uuid":"e95d23c4251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":false,"readable":false,"writable":true,"writeWithoutResponse":false},{"uuid":"e95db84c251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":true,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"e95dda90251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":true,"readable":true,"writable":false,"writeWithoutResponse":false},{"uuid":"e95dda91251d470aa062fa1922dfa9a8","name":"<Unnamed>","type":"(Custom Type)","notifiable":true,"readable":true,"writable":false,"writeWithoutResponse":false}]}]
Note - if you long press on a button it will output a 1 and then a 2
Hi @cymplecy . First of all, I would like to thank you your help.
The project I am doing It consist on a IoT which is formed by microbits and a Nordic.
I am trying to install bluetooth ble libraries in windows but I am getting some errors like "No bluetooth 4.0 devices found". After that, I investigate and found a solution which is install Zadig (a programm that install bluetooth ble drivers). However , It doesnt find any devices , as I read , Windows support in a native way BLE devices ( before installing Zadig I could Connect vía bluetooth with microbits, but not vía Node-Red because of the error I mentioned).
I have some questions about what you did:
1.- ¿Do you know if Windows sopports this libraries?
2.- ¿What O.S did you use?
3.- ¿Did you use your phone and then the data which took the phone were redirected yo Node-Red?
Thank you,
Best regards
Hi
Hi,
It's interesting the way you used. I would like to ask you a last question.
Why did you decide to do with the phone? I mean , why didnt you use only Raspberry - microbit ?
I had not used Bluetooth before so I thought it would be a good first step
I only did this work because someone asked a question about it and I was curious
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