noble/bleno

Unable to use GATT server with central role

Open

#326 ouverte le 6 juil. 2017

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help wanted

Description

I'm trying to use noble and bleno together in a single application to allow linux to be in the central role but also be the GATT server. I actually have this working, but had to remove an if statement in bleno. Namely, I had to remove this if:

BlenoBindings.prototype.onLeConnComplete = function(status, handle, role, addressType, address, interval, latency, supervisionTimeout, masterClockAccuracy) {
  // if (role !== 1) {
  //   // not slave, ignore
  //   return;
  // }
  ...
}

from here.

With that if the AclStream never gets set up and bleno never responds to discover services requests (or any other request).

I understand why that check is there, since a connection callback is valid in both the central and peripheral contexts, however, I believe a GATT server is equally valid in both contexts. Any thoughts on this? Would an environment variable be the right approach to skip that check in cases like mine?

Guide contributeur

Stack technique
javascriptnodejs
Domaine
backend
Type d'issue
feature
DifficultéDifficulté estimée pour un nouveau contributeur, de 1 pour un très petit changement à 5 pour un travail expert.
3
Temps estiméFourchette de temps approximative pour investiguer, implémenter, tester et préparer une pull request.
1-3 hours
Statut d'activitéDisponibilité apparente de l'issue : fraîche, active, ancienne, bloquée ou en attente d'un mainteneur.
stale
ClartéClarté avec laquelle l'issue explique le changement attendu, les critères d'acceptation et la prochaine étape.
clear
Prérequis
BLE central and peripheral rolesNode.js event handling
Accessibilité débutantScore de 1 à 100 estimant l'accessibilité de cette issue pour un premier contributeur.
20
Direction de recherche
Analyze the condition in bleno/lib/hci socket/bindings.js at onLeConnComplete where role !== 1 is checked. Evaluate whether GATT server can be valid in both central and peripheral roles. Consider implementing an environment variable to toggle this behavior, and test with dual role devices.