noble/bleno

TypeError: Object #<Object> has no method 'emit'

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#297 opened on Apr 26, 2017

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 (4 comments) (0 reactions) (0 assignees)JavaScript (2,083 stars) (465 forks)batch import
help wanted

Description

When I set my BLE module as the peripheral mode and run the echo example.

If I subscribe the indication and then unsubscribe it, the following error will occur.

root: /home/ubuntu/test/node_modules/bleno/lib/hci-socket/gatt.js:914 handleAttribute.emit('unsubscribe'); ^ TypeError: Object # has no method 'emit'

Contributor guide

Tech stack
javascriptnodejs
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of Node.js EventEmitterBasic knowledge of BLE (Bluetooth Low Energy)
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The error occurs at gatt.js:914 where `handleAttribute.emit('unsubscribe')` is called but handleAttribute does not have an emit method. This suggests that handleAttribute is not an instance of EventEmitter. Investigate the definition of handleAttribute in gatt.js to ensure it properly inherits from EventEmitter. Look for similar patterns in the codebase. Since the issue is open and no PRs are linked, this is available for a first time contributor to fix by ensuring handleAttribute is an EventEmitter.