Added reusing Device ID without session tokens

Author: Bjornskjald

src/Client.ts

@@ -16,12 +16,14 @@ import { AttachmentNotFoundError, AttachmentURLMissingError } from './types/Erro
 import StrictEventEmitter from 'strict-event-emitter-types'
 import ClientEvents from './ClientEvents'
 import * as Payloads from './mqtt/payloads'
+import DeviceId from './types/DeviceId'
 
 const debugLog = debug('fblib')
 
 export interface ClientOptions {
   selfListen?: boolean
   session?: Session
+  deviceId?: DeviceId
 }
 
 type ClientEmitter = StrictEventEmitter<EventEmitter, ClientEvents>
@@ -51,6 +53,10 @@ export default class Client extends (EventEmitter as { new(): ClientEmitter }) {
       session = { tokens: null, deviceId: null }
     }
 
+    if (options.deviceId) {
+      session.deviceId = options.deviceId
+    }
+
     if (!session.deviceId) {
       const deviceId = makeDeviceId()
       session.deviceId = deviceId