FIX Client configuration is fixed in the config file

Author: dmoranj

CHANGES_NEXT_RELEASE

@@ -1,2 +1,3 @@
 - Retry connection of the client if there is any error.
 - Capture Coap Router errors.
+- Client object of the library can't be configured when used as a library (#35).

README.md

@@ -284,6 +284,11 @@ Execute a read operation for the selected resource, identified following the LWT
 
 ### Client features 
 
+#### Configuration
+The LWM2M Client library has to be configured before any interaction with the remote LWM2M server. This configuration is done through the use of the `init()` function.
+This function takes a configuration object (can be the same one passed to the server), that has a `client` attribute with the configuraiton for the client (as described
+in the configuration section). Failing to do so may lead to unexpected results.
+
 #### Registration
 Before making any interaction with a Lightweight M2M server, a client must register to it. This registration can be done with the following function:
 ```

lib/lwm2m-client.js

@@ -32,7 +32,7 @@ var objRegistry = require('./services/client/objectRegistry'),
     coapRouter = require('./services/coapRouter'),
     Readable = require('stream').Readable,
     logger = require('logops'),
-    config = require('../config'),
+    config,
     context = {
         op: 'LWM2MLib.Client'
     };
@@ -316,6 +316,20 @@ function unregister(deviceInformation, callback) {
     req.end();
 }
 
+/**
+ * Sets the configuration the client module will use in its interactions.
+ *
+ * @param {Object} newConfig            Configuration object.
+ */
+function init(newConfig, callback) {
+    config = newConfig;
+
+    if (callback) {
+        callback();
+    }
+}
+
+exports.init = init;
 exports.registry = objRegistry;
 exports.register = register;
 exports.unregister = unregister;

test/unit/client/client-device-managment-test.js

@@ -43,6 +43,9 @@ describe('Client-side device management', function() {
         } else {
             localhost = '127.0.0.1';
         }
+
+        lwm2mClient.init(config);
+
         lwm2mClient.registry.reset(function() {
             memoryRegistry.clean(function () {
                 lwm2mServer.start(config.server, function (error, srvInfo) {

test/unit/client/client-information-management-test.js

@@ -47,6 +47,8 @@ describe('Client-side information management', function() {
             localhost = '127.0.0.1';
         }
 
+        lwm2mClient.init(config);
+
         lwm2mServer.start(config.server, function (error, srvInfo) {
             testInfo.serverInfo = srvInfo;
 

test/unit/client/client-registration-test.js

@@ -41,6 +41,8 @@ describe('Client-initiated registration', function() {
             localhost = '127.0.0.1';
         }
 
+        lwm2mClient.init(config);
+
         lwm2mClient.registry.reset(function() {
             memoryRegistry.clean(function () {
                 lwm2mServer.start(config.server, function (error, srvInfo) {