Responding to MTU Requests

[BLE go Brrrrr]

Hello,

What's the correct way to respond to MTU requests with pc-ble-driver-js library? on a pair of nRF52840 USB Dongles, using nRF Connect for Desktop, project based on pc-nrfconnect-boilerplate

Calling requestAttMtu() on one device starts the request but how to send the ATT request and MTU Exchange? Is there a function or shouldn't the API handle this semi-autonomously? 

adapterToUse.on('attMtuRequest', (device, mtu) => {
    console.log(`attMtuRequest: Connected device ${device.instanceId} has requested MTU: ${mtu}`);

    // How to set this MTU correctly? and respond to MTU request?
    adapterToUse._attMtuMap[device.instanceId] = mtu // obviously not correct way
});

Thanks

[Hung Bui]

Hi,
Our expert in pc-ble-driver-js is currently on vacation, I will try to help in the mean time. If you have a look at this sequence chart the application should return with sd_ble_gatt_exchange_mtu_reply().

As far as I can see in the js library , you would need to call attMtuReply() . If you have a look here you can see how it's handled.
This devzone case might be useful as well.