Connect to nrf52

[chipimix]

Hi!
I'm trying to use this module to connect to a nrf52 with NUS service.
However when I run this code:
`var winnus = require("winnus");

var device = winnus.getDevices()[0];
console.log(device)
winnus.connect(device, function(data) {
console.log("Got data "+JSON.stringify(data));
});`
It fails on connect:

Am I doing something wrong? does this module work exclusively for puck.js devices?
Thanks!

[gfwilliams]

Hi - I'm afraid I don't know exactly what the issue is. How are you creating the NUS service on the device? Using the Nordic ble_nus library?

There is nothing specific in there that requires a Puck.js or other Espruino device, so it should work just fine

[chipimix]

Thanks for the answer!
Yes we're using ble_nus library, is there something in particular I should be doing?

[gfwilliams]

No - I'm extremely surprised then. It should 'just work' :(

[chipimix]

I think I know what the issue is but I'm not entirely sure how to solve it.
From what I understand, when we subscribe a characteristic with the notify attribute, we're basically writing something like [0x01,0x00] to the Client Characteristic Configuration Descriptor.
In the case of my nRF52 board and the specifications of NUS, the CCCD UUID is 0x2902; however I think winnus will try to write it to 0x2901.
I think this is what's happening and considering the BluetoothGATTSetDescriptorValue error, it would make sense. Any thoughts on how I can make this parameterizable or hardcode it? Thanks!

[gfwilliams]

Ahh, interesting - thanks for spotting that!

Well, I assume it's this check? https://github.com/espruino/winnus/blob/master/cpp/winnus.cpp#L494

There must be a better way to handle it...