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Ok
Thanks

it seem that now everything is working for me (almost),
I will continue working - and if I will have more question I will ask.

Thank you very much for the help!

so I can't read the pin status and know if it's "1" \ "0"?

Ok, it's working - thank you!

but now I see another problem ,
when I try to read the pin status using this command:

NRF.setServices({
  "3e440001-f5bb-357d-719d-179272e4d4d9": {
    "3e440002-f5bb-357d-719d-179272e4d4d9": {
      description: "Setup Led",  // optional, default is null,
      writable : true,
      readable : true,
      notify: true,
      maxLen : 10,
      value : "Setup_Data",
      onWrite : function(evt) {
        data = evt.data[0];
        g.clear();
        g.setFontVector (20);
        g.drawString('Data receive',2,2);
        g.drawString(data,2,40);
        g.flip();
        if (data =="1") {
       // if (data < 18) {
           digitalWrite(LED, 1);
           digitalWrite(Relay_Pin, 1);
            }
       else {
       digitalWrite(LED, 0);
       digitalWrite(Relay_Pin, 0);}
       Relay_Status = digitalRead(Relay_Pin); 

      }
    },
	"3e440008-f5bb-357d-719d-179272e4d4d9": {
     description: "Device Temp",  // optional, default is null,
      readable : true,
      notify: true,
      value : [E.getTemperature()]
    }
  }
}, {});

it turn off the led that connected to Relay_Pin

when I remove the this line - the led stay on
what could be the problem ?
when I read the data from "nRF" I can see the value is "0x01"

and one final "understanding" question:
if I understand correct - there is no need for the connected device to know the Service UUID , just the CHAR uuid
there is no used of the service - right ?

***I mange to make my Python code work - and there I only used the CHAR UUID , didn't use \ took any attention for the Service UUID

when I print to the OLED
E.getTemperature() - I get 24.5 , so it's OK
so if I will use this Characteristic for the temperature '2A6E' - will it show me ok on the nRF?
I have looked here
https://programmaticponderings.com/2020/­08/04/getting-started-with-bluetooth-low­-energy-ble-and-generic-attribute-profil­e-gatt-specification-for-iot/

and you can see in the nRf he is showing decimal value and say it's temp
https://programmaticponderings.files.wor­dpress.com/2020/08/screenshot_20200731-1­85558-5.png

I guess I will need to change the UUID also , no ?

Thanks ,

About my code

1. can I see the MAC of the remote device that connected?
   I want to print it on the OLED , for testing
   

2. I have wrote this code , it's seem to be working,
   my problem is when I disconnect:
   LED2 is off (as it should be)
   but on the OLED I still see "Connected" and the temp is changing every 5 seconds
   I guess it's because the Interval function that is still running
   can you see what I did wrong?

   My_MAC = NRF.getAddress();
   Relay_Pin = 22;
   
   print("My MAC address is " , My_MAC);
   var n = 0;
   
   
   function start(){
   // write some text
   g.setFontVector (20);
   g.drawString("David Test!",2,2);
   g.drawString("BLE ON",2,40);
   // write to the screen
   g.flip();
   }
   
   function BLE_Connect(){ 
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440008-f5bb-357d-719d-179272e4d4d9" : {
     value :  [E.getTemperature()],//to be able to see that read is correct
     notify: true
   }
   
   }
   });
   g.clear();
   g.setFontVector (20);
   g.drawString("Connected!",2,2);
   g.setFontVector (10);
   g.drawString("Temp is: " + E.getTemperature(), 1, 40);
   g.flip();
   }, 5000);
   
   }
   
   function BLE_Disconnect(){
   g.clear();
   g.setFontVector (20);
   g.drawString("Waiting!",2,2);
   g.flip();
   }
   
   var i2c = new I2C();
   i2c.setup({ scl : D20, sda: D19 });
   var g = require("SSD1306").connect(i2c, start);
   
   
   NRF.setAdvertising({}, {name:"OfficeTest"});
   
   NRF.setServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9": {
   "3e440002-f5bb-357d-719d-179272e4d4d9": {
     description: "Setup Led",  // optional, default is null,
     writable : true,
     readable : true,
     notify: true,
     maxLen : 10,
     value : "Setup_Data",
     onWrite : function(evt) {
       data = evt.data[0];
       if (data < 18) {
           digitalWrite(LED, 1);
           digitalWrite(Relay_Pin, 1);
           }
      else {
      digitalWrite(LED, 0);
      digitalWrite(Relay_Pin, 0);}
   
     }
   },
   	"3e440008-f5bb-357d-719d-179272e4d4d9": {
    description: "Device Temp",  // optional, default is null,
     readable : true,
     notify: true,
     value : ["Temp_Location"]
   }
   }
   }, {});
   
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440002-f5bb-357d-719d-179272e4d4d9" : {
     value :  [data, heartrate],//to be able to see that read is correct
     notify: true
   },
   }
   }); }, 5000);
   
   // On disconnect, turn off led
   NRF.on('disconnect', function() {
   digitalWrite(LED2, 0);
   BLE_Disconnect();
   });
   
   NRF.on('connect', function() {
   digitalWrite(LED2, 1);
   BLE_Connect();
     
   });
   

Thank you again ,

Obviously :-)

it's working

thanks,

OK
I will stay with the nRF

Thanks,

I'm using this device
128×64 OLED display module (SSD1306) , I will try

just to be ready
if I take the code:

function start(){
 // write some text
 g.drawString("Hello World!",2,2);
 // write to the screen
 g.flip();
}

// I2C
I2C1.setup({scl:B6,sda:B7});
var g = require("SSD1306").connect(I2C1, start);

it's should work ?
will change it to print if someone is connected or not

Thanks ,

so 3.5 questions about it :

1. I guess I need to convert the 0x1D to 29 using some java hex to DEC function ?
   
2. I'm trying to read it using nRF , as I understand from the API Reference
   
3. 
   > NRF.setServices({ 0xBCDE : {
   > 0xABCD : {
   > value : "Hello", // optional
   > description: "My Characteristic", // optional, default is null,
   
   

I thought maybe I can write something there - but if it's no used , so never mind.

1. what is 'heartrate' mean in the value section ?

   NRF.setServices({
   0x180D: { // heart_rate
   0x2A37: { // heart_rate_measurement
     notify: true,
     value : [0x06, heartrate],
   }
   }
   }, { advertise: [ '180D' ] });
   

does it tell that the data is bpm ? - if I'm correct :
where can I find a list of what I can put \ which values?

can I say I'm sending temperature using

value = [0x1d, temperature]

then when I will read the data it will change it to C and I will see 29 ?

3.5 what will be if I'm sending heartrate using my own UUID ?

Thanks ,

When I scan Bluetooth on my windows - I can see and connect to the Espruino device ,
but can I read and write data , and maybe see the rssi ?

Thanks,

Ok I will try it today ,

some more "basic" questions

1. I'm trying to change the description of the UUID, but I get unknown all the time
   

2. I want to send the temperature - but when I read I get "1D" - what do I need to change so it will know it's temperature value and now byte data?

   NRF.setServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9": {
   "3e440002-f5bb-357d-719d-179272e4d4d9": {
     description: "My_LED_UUID",  // optional, default is null,
     writable : true,
     readable : true,
     notify: true,
     maxLen : 10,
     value : "Setup_Data",
     onWrite : function(evt) {
       data = evt.data[0];
       if (data < 18) {
   digitalWrite(LED, 1);
   digitalWrite(Relay_Pin, 1);
   }
      else {
      digitalWrite(LED, 0);
      digitalWrite(Relay_Pin, 0);}
   
     }
   },
   	"3e440008-f5bb-357d-719d-179272e4d4d9": {
    description: "Device_Temp",  // optional, default is null,
     readable : true,
     notify: true,
    value : [E.getTemperature()]
   }
   }
   }, {});
   
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440002-f5bb-357d-719d-179272e4d4d9" : {
     value :  [data],//to be able to see that read is correct
     notify: true
   },
   "3e440008-f5bb-357d-719d-179272e4d4d9" : {
     value :  [E.getTemperature()],//to be able to see that read is correct
     notify: true
   }
   
   }
   }); }, 5000);
   

what am I missing?

Thanks ,

OK - nice solution ,
and this is better then solution then a password?

also what will happened when someone will try to connect using the IDE and upload new code?

Hello,
I'm trying to connect an Oled to my MDSB42Q - so it show messages on connect\disconnect

var i2c = new I2C();
i2c.setup({ scl : D20, sda: D19 });

is the setup OK?
and how do I send to him text
is there a library to download \ use?

Thanks ,

Ok
so we are on the right way :-)

security question (before I continue with the python)
is there any way I can secure the connection ?
I will explain
right now
if someone will take a computer and run "Espruino Web IDE", scan - he will see my device.
and then he will be able to connect to him and do what evert he want - right?
(the same way I'm running now and uploading the code).
How can I make him request password before connecting ?

and another question
can I use this security (password) in order to connect to the device and read the data ?
I want only verified devices to be able to read the Espruino data
right now any one can connect and read

Thanks,

first of all
thank you fir the help so far , you don't need to apologize :-)

this is what I have now :

1. created a device called "Test_Read_Write" - I can see it on BLE Scan
   
2. I have open "nRf" on by Android device and mange to connect to it .
   sending < 18 - led is on , > 18 led is off - so communication is working.
   

3. I'm trying to add update service , did I do it right ?
   I can see the data is changing when I send something to the device
   but is there a function I can call to update the value only after the data is change?
   and not print it once every 1000mSec (like I did)?
   it will be better no ?

   My_MAC = NRF.getAddress();
   
   print("My MAC address is " , My_MAC);
   var n = 0;
   
   NRF.setAdvertising({}, {name:"Test_Read_Write1"});
   
   NRF.setServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9": {
   "3e440002-f5bb-357d-719d-179272e4d4d9": {
     writable : true,
     maxLen : 5,
     onWrite : function(evt) {
       n = evt.data[0];
       if (n < 18) {
   digitalWrite(LED, 1);
   }
      else {
      digitalWrite(LED, 0);}
   
     }
   },
   	"3e440003-f5bb-357d-719d-179272e4d4d9": {
     readable : true,
     notify: true,
     value : ["hello"]
   }
   }
   }, {});
   
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440003-f5bb-357d-719d-179272e4d4d9" : {
     value :  [n],
     notify: true
   }
   }
   }); }, 1000);
   
   // On disconnect, turn off led
   NRF.on('disconnect', function() {
   digitalWrite(LED, 0);
   });
   
   
   

when I upload the code I see this error :

BLE Connected, queueing BLE restart for later
Uncaught Error: Can't update services until BLE restart
 at line 37 col 2 in .bootcde

is this OK ? or does it mean I have a problem ?

***after I will see everything is working on with my phone , I will need your help with the python error of sending data

Thanks ,

I have mange to work and took an working example from here:
https://www.espruino.com/BLE+Communicati­ons

this is the code I have wrote:

My_MAC = NRF.getAddress();

print("My MAC address is " , My_MAC);
var n = "0";

NRF.setServices({
  "3e440001-f5bb-357d-719d-179272e4d4d9": {
    "3e440002-f5bb-357d-719d-179272e4d4d9": {
      writable : true,
      onWrite : function(evt) {
        n = evt.data[0];
        if (n < 18) {
  digitalWrite(LED, 1);
}
       else {
       digitalWrite(LED, 0);}

      }
    },
	"3e440003-f5bb-357d-719d-179272e4d4d9": {
      readable : true,
      value : [getTime()]
    }
  }
}, {});

// On disconnect, turn off led
NRF.on('disconnect', function() {
  digitalWrite(LED, 0);
});


NRF.setAdvertising({}, {name:"Test_Read_Write"});

when I connect using android phone "nRF Connect "
I can see I have 2 chars from 1 service
3e440002 is write
3e440003 is read

I have 3 questions :
when I connect to the 3e440002 - and send any byte - LED is on (which is good for me to understand how things works )
when I connect to 3e440003 - he only show me "4C 'L'"

1. what do I need to do in order to see "live" data (timestamp - just to see it's alive), or even the latest byte I sent to the device?
   
2. is there any to see console.print while I'm connecting using web ide on my computer?
   or do I have to connect it using serial cables?
   

3. when I use a python code to send data I get this error:

   Characteristic 3e440002-f5bb-357d-719d-179272e4d4d9 does not support write operations!
   

when I use the same code to connect to Arduino with the same chars - I can send data to it ,
also as I mention before - on android nRF I can send messages

so what am I missing ?

Thanks ,

Hello,
I have a simple project I want to run and want to know if I can use the MDBT42Q
I want to see I understand the configuration correct:

1. PI4 will be able to connect to him and send it 2 simple messages ("0" \ "1"), the it will change the digital output of 1 selected Digital pin(that will be connected to relay ) .
   so the PI is the client and the MDBT42Q will be the server , right ?
   
2. what is the approximately~ distance I can use for communication ?
   
3. can I connect an external antenna to the MDBT42Q and see if it's make any changes?
   
4. I have a working code on Arduino BLE( my problem with the Arduino is the distance , I get around ~ 4 meters only ), can I publish the code here and get some help converting it to java?
   
   

Thanks,

I know the problem is on my side ....
so maybe you can guide me to understanding
all I want to do is connect from the PI to the device and turn on\off led1

this is what I'm missing :
1.up until now when I wanted to turn LED1 on I wrote
LED1.write(true)
and now you say I need to write 'LED1.set()\n' - do I need to add true\false ?

1. after I have connected to the device , why can't I see the data I'm sending to him , is there any way to write something to log in order to see where is the problem ?
   all I can see is -> Bluetooth
   I'm sending sample data once every 10 seconds , and I can't see anything - why?
   
   

I read somewhere I can use Node-RED for creating a project and connecting with the MDB42Q
I mange to create a connection and I'm sending data from it - but again, I don't see anything on the device - the led is not tuen on\off
do you have an example\guide for it?

I think we misunderstanding each other.... :-)

can you show an example code to put on the mdb42q
all I want it to do it to be connactable from 1 knonwn MAC address and wait for message
I don't need it to send\advertise\publish nothing

just to be connected and wait for message

this is what I have done :

console.log("Startup");
NRF.setAdvertising([
 
  {//here I put the HEX data -https://www.bluetooth.com/specification­s/gatt/characteristics/
 
  } 
], { //here I put the defualt data ONLY!
   name : "Devcie TEST",
   showName: true,
   discoverable : true,
   connectable : true,
   scannable : true,
   interval:100
});

I can see the device in scanning
I mange to connect to him - because I can see this in the IDE :

-> Bluetooth

and on my PI I can see I'm connected

now what I need to add in order to read the data I'm sending from the PI (sending json {'open'})

Thank you ,

so maybe I'm not it the right place
can Espruino be used as client? meaning can I send data to it?
or they are ony used as "server" and send data to other devcies?
** maybe I need another solution

Thanks,

Thank you !

I have 2 old devices , that sending data \ searching and doing all kind of unkonw things
what do I need to do so they will reset to factory-default?

Thanks,

maybe I didn't explain correct
I have connected to the mdb42q a LED in GPIO D15 (it this OK?)
I want to control the LED from the PI
I have the MAC address of the PI - I want it to connect only to it
DC::32::9A:**

I have found this - and I can see it connect to the pi

var gatt;
NRF.connect(" DC:**:32:**:9A:**").then(function(g) {
  gatt = g;
}).then(function(service) {
  console.log("connected");
  return gatt.startBonding();
}).then(function() {
  gatt.disconnect();
 console.log("Done!");
});

what else do I need to write in order to make hi m"wait" for my command ON\Off?

and do you have an exapmle what need to do on the pi side?

Hello,
I want to connect to the mdb42q from my pi and be able to send him 2 types of messages to light up 2 ciruict (let's make it simple - want to control 2 gpio "1"\"0" from the pi)

is there a guide \ example I can follow ?

also can I make a secure connection, meaning allow to connect only from known MAC address only?
so only my Pi will be able to connect to the device ?

Thanks,

---

I have try this example

var gatt;
NRF.requestDevice({ filters: [{ name: 'PI4' }] }).then(function(device) {
  console.log("found device");
  return device.gatt.connect();
}).then(function(g) {
  gatt = g;
  console.log("connected");
  return gatt.startBonding();
}).then(function() {
  console.log("bonded", gatt.getSecurityStatus());
  gatt.disconnect();
}).catch(function(e) {
  console.log("ERROR",e);
});

My pi name is PI4 - I can see it in bluetooth and ble scan from my phone
so what is wrong? missing?

have try namePrefix: 'PI4'
have also try to use th service I used which is '1322' - get the same resualt

NRF.requestDevice({ filters: [{services: ['1322'] }] }).then(function(device) {

ERROR No device found matching filters

Thanks !
I will give it a try

no
the device is connected using serial TX\RX pins to a serail device that connect to the internet .
If I choose the COM of the device from my computer on the IDE - I can upload\see the MDBT42 .
my question is if I can upload new code not using the IDE \ using some kind of API
or maybe (just thought about it) send a command to the MDBT42 and tell him to download a new code ?
is there such a thing?
** No is also a good answer :-)

Thanks ,