Cannot see service ID

[espruino-discuss2]

Posted at 2023-05-08 by user155409

I am trying to create a service that allows external applications to buzz the BangleJS. At the moment I'm just trying to write a very simple new service to make sure I can connect. I use this code in the Web IDE:

NRF.setServices({
  CUSTOM_SERVICE_UUID: {
    CUSTOM_CHARACTERISTIC_UUID: { 
      notify: true,
      writable : true,
      broadcast : true,
      readable : true
    }
  }
}, { advertise: [ CUSTOM_SERVICE_UUID ] });

But when I use a web browser to scan for services using Web BLE on a second program, OR from a secondary C++ application none of my programs see my new service ID. They see the NUS service UUID [6e400001-b5a3-f393-e0a9-e50e24dcca9e] and the GATT service id [ 0001801-0000-1000-8000-00805f9b34fb], but they don't see any other services. Do I have to do something special to advertise my new service? How do I get it to show up in scans?

Thanks!

[espruino-discuss2]

Posted at 2023-05-08 by @fanoush

too bad you did not include declaration of CUSTOM_SERVICE_UUID

if you use short service id format then in the advertise bit try to use string constant as used here https://www.espruino.com/Reference#l_NRF_setServices

if you use long guid then it may be issue with not enough space in advertising packet and/or doing only passive scan that does not parse scan response

long guid is 16 bytes, together with the nordic uart it cannot fit into 31bytes of advertising packet so it is most probably in scan response

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Posted at 2023-05-08 by user155409

ahhh, I will try that--thanks!