diff --git a/noble/noble-tests.ts b/noble/noble-tests.ts
index 46851ab523..4b1d396564 100644
--- a/noble/noble-tests.ts
+++ b/noble/noble-tests.ts
@@ -33,10 +33,17 @@ peripheral.advertisement = {
     manufacturerData: new Buffer(1),
     serviceUuids:     ["0x180a", "0x180d"]
 };
+peripheral.connect();
 peripheral.connect((error: string): void => {});
+peripheral.disconnect();
 peripheral.disconnect((): void => {});
+peripheral.updateRssi();
+peripheral.updateRssi((error: string, rssi: number): void => {});
+peripheral.discoverServices(["180d"]);
 peripheral.discoverServices(["180d"], (error: string, services: noble.Service[]): void => {});
+peripheral.discoverAllServicesAndCharacteristics();
 peripheral.discoverAllServicesAndCharacteristics((error: string, services: noble.Service[], characteristics: noble.Characteristic[]): void => {});
+peripheral.discoverSomeServicesAndCharacteristics(["180d"], ["2a38"]);
 peripheral.discoverSomeServicesAndCharacteristics(["180d"], ["2a38"], (error: string, services: noble.Service[], characteristics: noble.Characteristic[]): void => {});
 peripheral.readHandle(new Buffer(1), (error: string, data: NodeBuffer): void => {});
 peripheral.writeHandle(new Buffer(1), new Buffer(1), true, (error: string): void => {});
@@ -50,7 +57,9 @@ service.uuid = "180a";
 service.name = "";
 service.type = "";
 service.includedServiceUuids = ["180d"];
+service.discoverIncludedServices(["180d"]);
 service.discoverIncludedServices(["180d"], (error: string, includedServiceUuids: string[]): void => {});
+service.discoverCharacteristics(["2a38"]);
 service.discoverCharacteristics(["2a38"], (error: string, characteristics: noble.Characteristic[]): void => {});
 service.on("includedServicesDiscover", (includedServiceUuids: string[]): void => {});
 service.on("characteristicsDiscover", (characteristics: noble.Characteristic[]): void => {});
@@ -60,10 +69,15 @@ characteristic.uuid = "2a37";
 characteristic.name = "";
 characteristic.type = "";
 characteristic.properties = ["read", "notify"];
+characteristic.read();
 characteristic.read((error: string, data: NodeBuffer): void => {});
+characteristic.write(new Buffer(1), true);
 characteristic.write(new Buffer(1), true, (error: string): void => {});
+characteristic.broadcast(true);
 characteristic.broadcast(true, (error: string): void => {});
+characteristic.notify(true);
 characteristic.notify(true, (error: string): void => {});
+characteristic.discoverDescriptors();
 characteristic.discoverDescriptors((error: string, descriptors: noble.Descriptor[]): void => {});
 characteristic.on("read", (data: NodeBuffer, isNotification: boolean): void => {});
 characteristic.on("write", true, (error: string): void => {});
@@ -75,7 +89,9 @@ var descriptor: noble.Descriptor = new noble.Descriptor();
 descriptor.uuid = "";
 descriptor.name = "";
 descriptor.type = "";
+descriptor.readValue();
 descriptor.readValue((error: string, data: NodeBuffer): void => {});
+descriptor.writeValue(new Buffer(1));
 descriptor.writeValue(new Buffer(1), (error: string): void => {});
 descriptor.on("valueRead", (error: string, data: NodeBuffer): void => {});
 descriptor.on("valueWrite", (error: string): void => {});
diff --git a/noble/noble.d.ts b/noble/noble.d.ts
index f9c833bd13..fb0a7a491f 100644
--- a/noble/noble.d.ts
+++ b/noble/noble.d.ts
@@ -25,11 +25,12 @@ declare module "noble" {
         rssi:          number;
         services:      string[];
 
-        connect(callback: (error: string) => void): void;
-        disconnect(callback: () => void): void;
-        discoverServices(serviceUUIDs: string[], listener: (error: string, services: Service[]) => void): void;
-        discoverAllServicesAndCharacteristics(callback: (error: string, services: Service[], characteristics: Characteristic[]) => void): void;
-        discoverSomeServicesAndCharacteristics(serviceUUIDs: string[], characteristicUUIDs: string[], callback: (error: string, services: Service[], characteristics: Characteristic[]) => void): void;
+        connect(callback?: (error: string) => void): void;
+        disconnect(callback?: () => void): void;
+        updateRssi(callback?: (error: string, rssi: number) => void): void;
+        discoverServices(serviceUUIDs: string[], callback?: (error: string, services: Service[]) => void): void;
+        discoverAllServicesAndCharacteristics(callback?: (error: string, services: Service[], characteristics: Characteristic[]) => void): void;
+        discoverSomeServicesAndCharacteristics(serviceUUIDs: string[], characteristicUUIDs: string[], callback?: (error: string, services: Service[], characteristics: Characteristic[]) => void): void;
 
         readHandle(handle: NodeBuffer, callback: (error: string, data: NodeBuffer) => void): void;
         writeHandle(handle: NodeBuffer, data: NodeBuffer, withoutResponse: boolean, callback: (error: string) => void): void;
@@ -57,8 +58,8 @@ declare module "noble" {
         includedServiceUuids: string[];
         characteristics:      Characteristic[];
 
-        discoverIncludedServices(serviceUUIDs: string[], callback: (error: string, includedServiceUuids: string[]) => void): void;
-        discoverCharacteristics(characteristicUUIDs: string[], callback: (error: string, characteristics: Characteristic[]) => void): void;
+        discoverIncludedServices(serviceUUIDs: string[], callback?: (error: string, includedServiceUuids: string[]) => void): void;
+        discoverCharacteristics(characteristicUUIDs: string[], callback?: (error: string, characteristics: Characteristic[]) => void): void;
         toString(): string;
 
         on(event: string, listener: Function): events.EventEmitter;
@@ -73,11 +74,11 @@ declare module "noble" {
         properties:  string[];
         descriptors: Descriptor[];
 
-        read(callback: (error: string, data: NodeBuffer) => void): void;
-        write(data: NodeBuffer, notify: boolean, callback: (error: string) => void): void;
-        broadcast(broadcast: boolean, callback: (error: string) => void): void;
-        notify(notify: boolean, callback: (error: string) => void): void;
-        discoverDescriptors(callback: (error: string, descriptors: Descriptor[]) => void): void;
+        read(callback?: (error: string, data: NodeBuffer) => void): void;
+        write(data: NodeBuffer, notify: boolean, callback?: (error: string) => void): void;
+        broadcast(broadcast: boolean, callback?: (error: string) => void): void;
+        notify(notify: boolean, callback?: (error: string) => void): void;
+        discoverDescriptors(callback?: (error: string, descriptors: Descriptor[]) => void): void;
         toString(): string;
 
         on(event: string, listener: Function): events.EventEmitter;
@@ -94,8 +95,8 @@ declare module "noble" {
         name: string;
         type: string;
 
-        readValue(callback: (error: string, data: NodeBuffer) => void): void;
-        writeValue(data: NodeBuffer, callback: (error: string) => void): void;
+        readValue(callback?: (error: string, data: NodeBuffer) => void): void;
+        writeValue(data: NodeBuffer, callback?: (error: string) => void): void;
         toString(): string;
 
         on(event: string, listener: Function): events.EventEmitter;