remy

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• Trouble with: setAdvertising heart_rate

  @remy started

  • 24 comments
  • 771 views

  @renebohne replied
• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  Yeah, putting the setAdvertising in the update did seem to do the trick.

  Still a bit weird that the name isn't set, though I can see it on the nRF Connect app if I explicitly read the value, but my browser (via webBT) is still reading the old "Pluck 1234" value. Not a biggie though.

  Now seeing if I can add some more services to this poor little puck!

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  One really weird thing I do see, is if I redeploy the code, the service no longer advertises correctly (it's like it completely resets).

  I'm having to do a hard reset on the puck to get back to advertising.

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  Quick update, I've got the heart_rate service advertising and "working". Note that I lifted the setAdvertising values from here and just copied the GAPSETADVDATA value into a hex array, but I really don't understand why it works.

  var hr = 65;
  
  function update() {
    hr++;
    if (hr > 120) {
      hr = 65;
    }
    
    NRF.updateServices({
      0x180D: { // heart_rate
        0x2A37: { // heart_rate_measurement
          notify: true,
          value : [0x06, hr],
        }
      }
    });
    
    setTimeout(update, 1000);
  }
  
  NRF.setServices({
    0x180D: { // heart_rate
      0x2A37: { // heart_rate_measurement
        notify: true,
        value : [0x06, hr],
      },
      0x2A38: {
        readable: true,
        value: [0x02]
      }
    }
  });
  
  
  NRF.setAdvertising([
    0x02,
    0x01,
    0x06,
    0x05,
    0x02,
    0x0d,
    0x18,
    0x0a,
    0x18
  ], {
    name: "puck heart", // this doesn't stick at all, no idea why
    showName: true,
    discoverable: true,
    interval: 600
  });
  
  // if I update too early, it seems like GATT is still trying to do the previous updates
  setTimeout(update, 2000);
  

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  • 0x06 in the heart_rate_measurement is the flags and says that it's got contact.
    
  • 0x40 is the heart rate
    
  • 0x02 is the sensor location value
    
• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  Quick update, I'm able to read heart rate of 40bpm (with contact detected) and body sensor location: wrist on nRF.

  But it's not advertising (yet).

  Here's the code (because I'm not tracking changes!):

  NRF.setServices({
    0x180D: { // heart_rate
      0x2A37: { // heart_rate_measurement
        notify: true,
        readable: true,
        broadcast: true,
        value : [0x06, 0x40],
      },
      0x2A38: {
        readable: true,
        value: [0x02]
      }
    }
  });
  

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  Looking at this:

  AT+GATTADDCHAR=UUID=0x2A37, PROPERTIES=0x10, MIN_LEN=2, MAX_LEN=3, VALUE=00-40
  

  I'm not 100% sure how to represent the value 00-40 in a way that the puck will understand. Would I give it hex? Is this something else?

  I'm guessing that properties is one of the flags like readable, notify, etc - but not sure which. Is this the same as [0x00, 0x40]? Any ideas?

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  @Gordon I think I've found an adafruit example that I might be able to use as documentation, except I think I need to know where the bit flags for the setServices properties are set.

  For example, if I have broadcast: true, notify: true, where are those flags in C? What's the value of the GATT property? (I think…)

  I've been poking around the C files, but I'm not familiar with the code at all.

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  Oh, also note that I've tried sending the following - none really work:

  • value: 0x2C06
    
  • value: [0x06, 0x2C]
    
  • value: 0x062C
    
    

  …which does suggest I'm basically making it up as I go along!

• Trouble with: setAdvertising heart_rate

  in Puck.js, Pixl.js and MDBT42 • 1 year, 5 months

  

  @Gordon yeah, I've been reading through the specs (and parsing existing data).

  I know (hmm "know", not sure that's accurate!) that sending a value of 0x06, 0x2c should send the right flags to say the heart_rate monitor is connected and the heart rate is 44bpm.

  I was thinking something like this:

  NRF.setServices({
    0x180D: { // heart_rate
      0x2A37: { // heart_rate_measurement
        broadcast: true,
        readable: true,
        notify: true,
        indicate: true,
        value : 0x2C06,
      }
    }
  })
  

  Which does kinda work, but I also believe the device needs to advertise it has heart_rate services - which this doesn't seem to be doing, otherwise filtering for the service doesn't seem to work (or certainly the demo page I'm working from doesn't see it)