/
Device.ts
128 lines (107 loc) · 3.81 KB
/
Device.ts
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import {IDevice} from "./IDevice";
import {Characteristic, Peripheral} from "noble";
class Device implements IDevice {
public readonly id: string;
public readonly address: string;
private _peripheral: Peripheral
private _connected: boolean;
private _read: Characteristic
private _write: Characteristic
private _listeners: Array<(data: Buffer) => any>
public constructor(id: string, address: string, peripheral: Peripheral) {
this.id = id
this.address = address
this._peripheral = peripheral
this._connected = false
this._listeners = []
}
public connect(read?: string, write?: string): Promise<IDevice> {
const self = this
return new Promise<IDevice>((resolve, reject) => {
self._peripheral.connect(error => {
if(error) {
reject(error)
} else {
self.initCharacteristics(read, write)
.then(() => {
self.enableDataListener()
self._connected = true
resolve(self)
})
.catch(reject)
}
})
})
}
public disconnect(): Promise<IDevice> {
const self = this
return new Promise<IDevice>((resolve) => {
this.removeWrite()
this.removeRead()
self._peripheral.disconnect(() => {
this._listeners = []
this._connected = false
resolve(self)
})
})
}
public read(listener: (data: Buffer) => any): any {
this._listeners.push(listener)
}
public write(data: Buffer): Promise<void> {
const self = this
return new Promise<void>((resolve, reject) => {
self._write.write(data, false, error => {
if(error) {
reject(error)
} else {
resolve()
}
})
})
}
private initCharacteristics(read?: string, write?: string): Promise<void> {
const self = this
return new Promise<void>((resolve, reject) => {
self._peripheral.discoverAllServicesAndCharacteristics((error, services, characteristics) => {
if (error) {
reject(error);
} else {
characteristics.forEach(characteristic => {
if(read && characteristic.uuid === read) {
self._read = characteristic
} else if(write && characteristic.uuid === write) {
self._write = characteristic
}
})
if(read && !self._read) {
reject("Could not initialize read characteristic.")
} else if(write && !self._write) {
reject("Could not initialize write characteristic.")
} else {
resolve();
}
}
})
})
}
private enableDataListener(): void {
const self = this
this._read.subscribe()
this._read.on("data", (data: Buffer) => {
self._listeners.forEach(listener => listener(data))
})
}
private removeWrite(): void {
delete this._write
}
private removeRead(): void {
const self = this
this._listeners.forEach(listener => {
self._read.removeListener("data", listener)
})
this._read.unsubscribe()
delete this._read
}
}
export {Device}