Closes the connection and releases any system resources associated with the stream.

Send a message to a remote device. If the local device did't connected to the remote devices, it will call connectDevice(), then send the message. If

Obtains the BtHelperClient from the given context. @param context context @return an instance of BtHelperClient

Check if a given response should be published. @param response a given response @return if the response should be published

Call when found a new device. @param device the new device

Call when the discovery process completed. @param bondedList the remote devices those are bonded(paired). @param newList the remote devices those

Call before discovery devices.

Call when send a message succeed, and get a response from the remote device. @param status the status describes ok or error. 1 resp

Request for enable the device's bluetooth asynchronously. Throw a NullPointerException if the device doesn't have a bluetooth module.

discovery the devices. @param listener listener for the process

Set a filter use to check if a given response is an expect data. Throw a NullPointerException if the parameter is null. @param filter a custom filter

private constructor for singleton @param context context