diff --git a/README.md b/README.md
index f188ba7..519206f 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Therefore it's not easy to extend or modify it, or even bring new feature in.
 The idea of this project is to make a super simple node radius server, which is async by default. No complex
 thread handling, no other fancy thing. The basic goal is to make WPA2 authenticiation easy again.
 
-### 802.11x protocol in node
+### 802.1x protocol in node
 
 Another motivation is that it is very exciting to see how wireless protocols have evolved, and see
 how a implementation like TTLS works.
diff --git a/package.json b/package.json
index afeda0c..b9795ef 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
 	"dependencies": {
 		"debug": "^4.1.1",
 		"imap-simple": "^4.3.0",
-		"ldapauth-fork": "^4.3.1",
+		"ldapauth-fork": "^4.3.2",
 		"ldapjs": "^1.0.2",
 		"md5": "^2.2.1",
 		"native-duplexpair": "^1.0.0",
@@ -38,7 +38,7 @@
 		"@types/radius": "0.0.28",
 		"chai": "^4.2.0",
 		"eslint": "^6.8.0",
-		"mocha": "^7.0.1",
+		"mocha": "^7.1.0",
 		"prettier": "^1.19.1",
 		"typescript": "^3.8.2"
 	}
diff --git a/src/app.ts b/src/app.ts
index 35a98eb..09514ec 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -9,7 +9,8 @@ import { startTLSServer } from './tls/crypt';
 /* test node version */
 const testSocket = startTLSServer();
 if (typeof (testSocket.tls as any).exportKeyingMaterial !== 'function') {
-	console.error('UNSUPPORTED NODE VERSION FOUND!!')
+	console.error(`UNSUPPORTED NODE VERSION (${process.version}) FOUND!!`);
+
 	console.log('run "sudo npx n nightly" to get nightly build of node js.');
 	process.exit(-1);
 }
diff --git a/src/radius/handler/eap/eapMethods/EAP-MD5.ts b/src/radius/handler/eap/eapMethods/EAP-MD5.ts
index 5c7ebf5..db4c1ef 100644
--- a/src/radius/handler/eap/eapMethods/EAP-MD5.ts
+++ b/src/radius/handler/eap/eapMethods/EAP-MD5.ts
@@ -3,16 +3,10 @@
 /* eslint-disable no-bitwise */
 import { RadiusPacket } from 'radius';
 import debug from 'debug';
-import { ResponseAuthHandler } from '../../../../types/Handler';
 import { IPacketHandlerResult } from '../../../../types/PacketHandler';
 import { IEAPMethod } from '../../../../types/EAPMethod';
 import { IAuthentication } from '../../../../types/Authentication';
 
-interface IEAPResponseHandlers {
-	response: (respData?: Buffer, msgType?: number) => void;
-	checkAuth: ResponseAuthHandler;
-}
-
 export class EAPMD5 implements IEAPMethod {
 	getEAPType(): number {
 		return 4;
@@ -33,6 +27,8 @@ export class EAPMD5 implements IEAPMethod {
 	): Promise<IPacketHandlerResult> {
 		// not implemented
 
+		debug('eap md5 not implemented...');
+
 		return {};
 	}
 }
diff --git a/src/radius/handler/eap/eapMethods/EAP-TTLS.ts b/src/radius/handler/eap/eapMethods/EAP-TTLS.ts
index 79fe1cc..20d38ac 100644
--- a/src/radius/handler/eap/eapMethods/EAP-TTLS.ts
+++ b/src/radius/handler/eap/eapMethods/EAP-TTLS.ts
@@ -8,7 +8,6 @@ import { attr_id_to_name, attr_name_to_id } from 'radius';
 import debug from 'debug';
 
 import { encodeTunnelPW, ITLSServer, startTLSServer } from '../../../../tls/crypt';
-import { ResponseAuthHandler } from '../../../../types/Handler';
 import {
 	IPacket,
 	IPacketAttributes,
@@ -23,11 +22,6 @@ import { secret } from '../../../../../config';
 
 const log = debug('radius:eap:ttls');
 
-interface IEAPResponseHandlers {
-	response: (respData?: Buffer, msgType?: number) => void;
-	checkAuth: ResponseAuthHandler;
-}
-
 function tlsHasExportKeyingMaterial(
 	tlsSocket
 ): tlsSocket is {
diff --git a/src/types/EAPChallenge.ts b/src/types/EAPChallenge.ts
deleted file mode 100644
index d99dd4f..0000000
--- a/src/types/EAPChallenge.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export interface IEAPChallenge {
-	decode(data: Buffer, stateID: string): { username: string; password?: string };
-}
diff --git a/src/types/Handler.ts b/src/types/Handler.ts
deleted file mode 100644
index 165eb9a..0000000
--- a/src/types/Handler.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import { RadiusPacket } from 'radius';
-
-export type ResponseHandler = (
-	msg: Buffer
-) => Promise<{ identifier: number; response: ResponseHandler }>;
-export type ResponseAuthHandler = (
-	username: string,
-	password: string,
-	additionalAuthHandler?: AdditionalAuthHandler
-) => void;
-
-export interface IResponseHandlers {
-	response: ResponseHandler;
-	checkAuth: ResponseAuthHandler;
-}
-
-export type AdditionalAuthHandler = (
-	success: boolean,
-	params: { packet: RadiusPacket; attributes: any[]; secret: string }
-) => void;