diff --git a/sustainml_modules/requirements.txt b/sustainml_modules/requirements.txt
index 1e425ba..783d416 100644
--- a/sustainml_modules/requirements.txt
+++ b/sustainml_modules/requirements.txt
@@ -1,3 +1,4 @@
+carbontracker
 flask
 flask-socketio==5.2.0
 kaggle
diff --git a/sustainml_modules/sustainml_modules/sustainml-wp2 b/sustainml_modules/sustainml_modules/sustainml-wp2
index 618391c..5d0582c 160000
--- a/sustainml_modules/sustainml_modules/sustainml-wp2
+++ b/sustainml_modules/sustainml_modules/sustainml-wp2
@@ -1 +1 @@
-Subproject commit 618391c6982957f67a3240c0f1d647adaa18a866
+Subproject commit 5d0582c2a32ba923d951a18f3016c759af49e96b
diff --git a/sustainml_modules/sustainml_modules/sustainml-wp3 b/sustainml_modules/sustainml_modules/sustainml-wp3
index 8f60542..b896e6e 160000
--- a/sustainml_modules/sustainml_modules/sustainml-wp3
+++ b/sustainml_modules/sustainml_modules/sustainml-wp3
@@ -1 +1 @@
-Subproject commit 8f605427cfe1af0215ac6f0029d5f199274f3bc8
+Subproject commit b896e6ebe356d902d4aec342ed209fb13f785ef9
diff --git a/sustainml_modules/sustainml_modules/sustainml-wp5/backend_node.py b/sustainml_modules/sustainml_modules/sustainml-wp5/backend_node.py
index b30412a..589e5d8 100644
--- a/sustainml_modules/sustainml_modules/sustainml-wp5/backend_node.py
+++ b/sustainml_modules/sustainml_modules/sustainml-wp5/backend_node.py
@@ -17,6 +17,7 @@
 import threading
 import time
 import signal
+import sustainml_swig
 import sys
 from orchestrator_node import orchestrator_node, utils
 from werkzeug.serving import make_server
@@ -30,27 +31,28 @@
 # Flask server default route
 @server.route('/')
 def hello_world():
-    return jsonify({'mesage': 'Hello world! Use "/terminate" route to stop Back-end node.<br>'}), 200
+    return jsonify({'mesage': 'Hello world! Use "/terminate" route to stop Back-end node.'}), 200
 
 # Send user input data to orchestrator
 @server.route('/user_input', methods=['POST'])
 def user_input():
     data = request.json
-    ret = orchestrator.send_user_input(data)
-    if not ret:
+    task_id = orchestrator.send_user_input(data)
+    if task_id is None:
         return jsonify({'error': 'Invalid input data'}), 400
-    return jsonify({'message': 'User input data sent successfully.<br>'}), 200
+    return jsonify({'message': 'User input data sent successfully.',
+                    'task_id': utils.task_json(task_id)}), 200
 
 # Retrieve Node status methods
 @server.route('/status', methods=['GET'])
 def status():
-    return jsonify({'status': f'{orchestrator.get_all_status()}'}), 200
+    return jsonify({'status': orchestrator.get_all_status()}), 200
 
 @server.route('/status', methods=['POST'])
 def status_args():
     data = request.json
     node_id = data.get('node_id')
-    return jsonify({'status': f'{orchestrator.get_status(node_id)}'}), 200
+    return jsonify({'status': orchestrator.get_status(node_id)}), 200
 
 # Retrieve Node results methods
 @server.route('/results', methods=['GET'])
@@ -64,20 +66,26 @@ def results():
     model = orchestrator.get_results(utils.node_id.ML_MODEL_PROVIDER.value, last_task_id)
     hardware = orchestrator.get_results(utils.node_id.HW_PROVIDER.value, last_task_id)
     carbontracker = orchestrator.get_results(utils.node_id.CARBONTRACKER.value, last_task_id)
-    json = {f'{utils.string_node(utils.node_id.APP_REQUIREMENTS.value)}': f'{app_req}',
-            f'{utils.string_node(utils.node_id.ML_MODEL_METADATA.value)}': f'{metadata}',
-            f'{utils.string_node(utils.node_id.HW_CONSTRAINTS.value)}': f'{constraints}',
-            f'{utils.string_node(utils.node_id.ML_MODEL_PROVIDER.value)}': f'{model}',
-            f'{utils.string_node(utils.node_id.HW_PROVIDER.value)}': f'{hardware}',
-            f'{utils.string_node(utils.node_id.CARBONTRACKER.value)}': f'{carbontracker}'}
+    task_json = {'problem_id': last_task_id.problem_id(), 'iteration_id': last_task_id.iteration_id()}
+    json = {utils.string_node(utils.node_id.APP_REQUIREMENTS.value): app_req,
+            utils.string_node(utils.node_id.ML_MODEL_METADATA.value): metadata,
+            utils.string_node(utils.node_id.HW_CONSTRAINTS.value): constraints,
+            utils.string_node(utils.node_id.ML_MODEL_PROVIDER.value): model,
+            utils.string_node(utils.node_id.HW_PROVIDER.value): hardware,
+            utils.string_node(utils.node_id.CARBONTRACKER.value): carbontracker,
+            'task_id': task_json}
     return jsonify(json), 200
 
 @server.route('/results', methods=['POST'])
 def results_args():
     data = request.json
     node_id = data.get('node_id')
-    task_id = data.get('task_id')
-    return jsonify({f'{utils.string_node(node_id)}': f'{orchestrator.get_results(node_id, task_id)}'}), 200
+    json_task = data.get('task_id')
+    if json_task is not None:
+        task_id = sustainml_swig.set_task_id(json_task.get('problem_id', 0), json_task.get('iteration_id', 0))
+    else:
+        task_id = None
+    return jsonify({utils.string_node(node_id): orchestrator.get_results(node_id, task_id)}), 200
 
 # Flask server shutdown route
 @server.route('/shutdown', methods=['GET'])
diff --git a/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/orchestrator_node.py b/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/orchestrator_node.py
index e455d4c..2b60850 100644
--- a/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/orchestrator_node.py
+++ b/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/orchestrator_node.py
@@ -14,18 +14,22 @@
 """SustainML Orchestrator Node API specification."""
 
 from . import utils
+import numpy as np
 
 from sustainml_swig import OrchestratorNodeHandle as cpp_OrchestratorNodeHandle
 from sustainml_swig import OrchestratorNode as cpp_OrchestratorNode
 from sustainml_swig import NodeStatus
 import sustainml_swig
+import threading
 
 class OrchestratorNodeHandle(cpp_OrchestratorNodeHandle):
 
     def __init__(self):
 
-        self.node_status_ = {}
+        self.condition = threading.Condition()
         self.last_task_id = None
+        self.node_status_ = {}
+        self.result_status = {}
         # Parent class constructor
         super().__init__()
 
@@ -46,14 +50,37 @@ def on_new_node_output(
             self,
             id : int,
             data):
-        task = sustainml_swig.get_task_id(id, data)
-        if (self.last_task_id is None and task is not None) or (
-            self.last_task_id is not None and task is not None and task > self.last_task_id):
-            self.last_task_id = task
-        if task is None:
+        task_id = sustainml_swig.get_task_id(id, data)
+        if task_id is None:
             print(utils.string_node(id), "node output received.")
         else:
-            print(utils.string_node(id), "node output received from task", utils.string_task(task))
+            print(utils.string_node(id), "node output received from task", utils.string_task(task_id))
+        self.register_result(task_id, id)
+
+    def register_task(self, task_id):
+        with self.condition:
+            if (self.last_task_id is None and task_id is not None) or (
+                self.last_task_id is not None and task_id is not None and task_id > self.last_task_id):
+                self.last_task_id = task_id
+            self.result_status[utils.string_task(task_id)] = {
+                utils.node_id.APP_REQUIREMENTS.value: False,
+                utils.node_id.CARBONTRACKER.value: False,
+                utils.node_id.HW_CONSTRAINTS.value: False,
+                utils.node_id.HW_PROVIDER.value: False,
+                utils.node_id.ML_MODEL_METADATA.value: False,
+                utils.node_id.ML_MODEL_PROVIDER.value: False
+            }
+
+    def register_result(self, task_id, node_id):
+        with self.condition:
+            if utils.string_task(task_id) not in self.result_status:
+                self.register_task(task_id)
+            self.result_status[utils.string_task(task_id)][node_id] = True
+            self.condition.notify_all()
+
+    def results_available(self, task_id, node_id):
+        with self.condition:
+            return self.result_status[utils.string_task(task_id)].get(node_id, False)
 
 class Orchestrator:
 
@@ -76,110 +103,150 @@ def get_last_task_id(self):
         return self.handler_.last_task_id
 
     def get_all_status(self):
-        output = ""
+        json_output = {}
         for key, value in self.handler_.node_status_.items():
-            output += utils.string_node(key) + " node status " + utils.string_status(value) + "<br>"
-        if output == "":
-            output = "No nodes have reported their status yet.\n"
-        return output
+            json_output[utils.string_node(key)] = utils.string_status(value)
+        return json_output
 
     def get_status(self, node_id):
-        if node_id in self.handler_.node_status_:
-            return utils.string_status(self.handler_.node_status_[node_id])
+        if node_id is None:
+            return self.get_all_status()
         else:
-            return utils.string_status(utils.node_status.INACTIVE.value)
+            if node_id in self.handler_.node_status_:
+                return utils.string_status(self.handler_.node_status_[node_id])
+            else:
+                return utils.string_status(utils.node_status.INACTIVE.value)
 
     def get_app_requirements(self, task_id):
+        with self.handler_.condition:
+            while not self.handler_.results_available(task_id, utils.node_id.APP_REQUIREMENTS.value):
+                self.handler_.condition.wait()
+
         # retrieve node data
         node_data = sustainml_swig.get_app_requirements(self.node_, task_id)
         if node_data is None:
-            return {'Error': f"Failed to get {utils.string_node(utils.node_id.APP_REQUIREMENTS.value)} data for task {utils.string_task(task_id)}<br>"}
+            return {'Error': f"Failed to get {utils.string_node(utils.node_id.APP_REQUIREMENTS.value)} data for task {utils.string_task(task_id)}"}
 
         # Parse data into json
+        task_json = {'problem_id': task_id.problem_id(), 'iteration_id': task_id.iteration_id()}
         app_requirements_str_list = node_data.app_requirements()
-        json_output = {'app_requirements': f'{utils.string_std_vector(app_requirements_str_list)}<br>'}
+        json_output = {'task_id': task_json,
+                       'app_requirements': utils.string_std_vector(app_requirements_str_list)}
         return json_output
 
     def get_model_metadata(self, task_id):
+        with self.handler_.condition:
+            while not self.handler_.results_available(task_id, utils.node_id.ML_MODEL_METADATA.value):
+                self.handler_.condition.wait()
+
         # retrieve node data
         node_data = sustainml_swig.get_model_metadata(self.node_, task_id)
         if node_data is None:
-            return {'Error': f"Failed to get {utils.string_node(utils.node_id.ML_MODEL_METADATA.value)} data for task {utils.string_task(task_id)}<br>"}
+            return {'Error': f"Failed to get {utils.string_node(utils.node_id.ML_MODEL_METADATA.value)} data for task {utils.string_task(task_id)}"}
 
         # Parse data into json
+        task_json = {'problem_id': task_id.problem_id(), 'iteration_id': task_id.iteration_id()}
         keywords_str_list = node_data.keywords()
         metadata_str_list = node_data.ml_model_metadata()
-        json_output = {'keywords': f'{utils.string_std_vector(keywords_str_list)}<br>',
-                       'metadata': f'{utils.string_std_vector(metadata_str_list)}<br>'}
+        json_output = {'task_id': task_json,
+                       'keywords': utils.string_std_vector(keywords_str_list),
+                       'metadata': utils.string_std_vector(metadata_str_list)}
         return json_output
 
     def get_hw_constraints(self, task_id):
+        with self.handler_.condition:
+            while not self.handler_.results_available(task_id, utils.node_id.HW_CONSTRAINTS.value):
+                self.handler_.condition.wait()
+
         # retrieve node data
         node_data = sustainml_swig.get_hw_constraints(self.node_, task_id)
         if node_data is None:
-            return {'Error': f"Failed to get {utils.string_node(utils.node_id.HW_CONSTRAINTS.value)} data for task {utils.string_task(task_id)}<br>"}
+            return {'Error': f"Failed to get {utils.string_node(utils.node_id.HW_CONSTRAINTS.value)} data for task {utils.string_task(task_id)}"}
 
         # Parse data into json
+        task_json = {'problem_id': task_id.problem_id(), 'iteration_id': task_id.iteration_id()}
         max_value = node_data.max_memory_footprint()
         required_hardware = node_data.hardware_required()
-        json_output = {'max_memory_footprint': f'{max_value}<br>',
-                       'hardware_required': f'{utils.string_std_vector(required_hardware)}<br>'}
+        json_output = {'task_id': task_json,
+                       'max_memory_footprint': max_value,
+                       'hardware_required': utils.string_std_vector(required_hardware)}
         return json_output
 
     def get_ml_model_provider(self, task_id):
+        with self.handler_.condition:
+            while not self.handler_.results_available(task_id, utils.node_id.ML_MODEL_PROVIDER.value):
+                self.handler_.condition.wait()
+
         # retrieve node data
         node_data = sustainml_swig.get_model_provider(self.node_, task_id)
         if node_data is None:
-            return {'Error': f"Failed to get {utils.string_node(utils.node_id.ML_MODEL_PROVIDER.value)} data for task {utils.string_task(task_id)}<br>"}
+            return {'Error': f"Failed to get {utils.string_node(utils.node_id.ML_MODEL_PROVIDER.value)} data for task {utils.string_task(task_id)}"}
 
         # Parse data into json
+        task_json = {'problem_id': task_id.problem_id(), 'iteration_id': task_id.iteration_id()}
         model = node_data.model()
         model_path = node_data.model_path()
         model_properties = node_data.model_properties()
         model_properties_path = node_data.model_properties_path()
         input_batch = node_data.input_batch()
         target_latency = node_data.target_latency()
-        json_output = {'model': f'{model}<br>',
-                       'model_path': f'{model_path}<br>',
-                       'model_properties': f'{model_properties}<br>',
-                       'model_properties_path': f'{model_properties_path}<br>',
-                       'input_batch': f'{utils.string_std_vector(input_batch)}<br>',
-                       'target_latency': f'{target_latency}<br>'}
+        json_output = {'task_id': task_json,
+                       'model': model,
+                       'model_path': model_path,
+                       'model_properties': model_properties,
+                       'model_properties_path': model_properties_path,
+                       'input_batch': utils.string_std_vector(input_batch),
+                       'target_latency': target_latency}
         return json_output
 
     def get_hw_provider(self, task_id):
+        with self.handler_.condition:
+            while not self.handler_.results_available(task_id, utils.node_id.HW_PROVIDER.value):
+                self.handler_.condition.wait()
+
         # retrieve node data
         node_data = sustainml_swig.get_hw_provider(self.node_, task_id)
         if node_data is None:
-            return {'Error': f"Failed to get {utils.string_node(utils.node_id.HW_PROVIDER.value)} data for task {utils.string_task(task_id)}<br>"}
+            return {'Error': f"Failed to get {utils.string_node(utils.node_id.HW_PROVIDER.value)} data for task {utils.string_task(task_id)}"}
 
         # Parse data into json
+        task_json = {'problem_id': task_id.problem_id(), 'iteration_id': task_id.iteration_id()}
         hw_description = node_data.hw_description()
         power_consumption = node_data.power_consumption()
         latency = node_data.latency()
         memory_footprint_of_ml_model = node_data.memory_footprint_of_ml_model()
-        json_output = {'hw_description': f'{hw_description}<br>',
-                       'power_consumption': f'{power_consumption}<br>',
-                       'latency': f'{latency}<br>',
-                       'memory_footprint_of_ml_model': f'{memory_footprint_of_ml_model}<br>'}
+        json_output = {'task_id': task_json,
+                       'hw_description': hw_description,
+                       'power_consumption': power_consumption,
+                       'latency': latency,
+                       'memory_footprint_of_ml_model': memory_footprint_of_ml_model}
         return json_output
 
     def get_carbontracker(self, task_id):
+        with self.handler_.condition:
+            while not self.handler_.results_available(task_id, utils.node_id.CARBONTRACKER.value):
+                self.handler_.condition.wait()
+
         # retrieve node data
         node_data = sustainml_swig.get_carbontracker(self.node_, task_id)
         if node_data is None:
-            return {'Error': f"Failed to get {utils.string_node(utils.node_id.CARBONTRACKER.value)} data for task {utils.string_task(task_id)}<br>"}
+            return {'Error': f"Failed to get {utils.string_node(utils.node_id.CARBONTRACKER.value)} data for task {utils.string_task(task_id)}"}
 
         # Parse data into json
+        task_json = {'problem_id': task_id.problem_id(), 'iteration_id': task_id.iteration_id()}
         carbon_footprint = node_data.carbon_footprint()
         energy_consumption = node_data.energy_consumption()
         carbon_intensity = node_data.carbon_intensity()
-        json_output = {'carbon_footprint': f'{carbon_footprint}<br>',
-                       'energy_consumption': f'{energy_consumption}<br>',
-                       'carbon_intensity': f'{carbon_intensity}<br>'}
+        json_output = {'task_id': task_json,
+                       'carbon_footprint': carbon_footprint,
+                       'energy_consumption': energy_consumption,
+                       'carbon_intensity': carbon_intensity}
         return json_output
 
     def get_results(self, node_id, task_id):
+        if task_id is None:
+            task_id = self.get_last_task_id()
+
         if node_id == utils.node_id.APP_REQUIREMENTS.value:
             return self.get_app_requirements(task_id)
         elif node_id == utils.node_id.ML_MODEL_METADATA.value:
@@ -193,19 +260,40 @@ def get_results(self, node_id, task_id):
         elif node_id == utils.node_id.CARBONTRACKER.value:
             return self.get_carbontracker(task_id)
         else:
-            return utils.string_node(node_id) + " node does not have any results to show.<br>"
+            message = utils.string_node(node_id) + " node does not have any results to show."
+            return {'message': message, 'task_id': utils.task_json(task_id)}
 
     def send_user_input(self, json_data):
         pair = self.node_.prepare_new_task()
         task_id = pair[0]
         user_input = pair[1]
+        self.handler_.register_task(task_id)
 
         user_input.task_id(task_id)
         if (json_data.get('modality') is not None):
             user_input.modality(json_data.get('modality'))
-        if (json_data.get('problem_type') is not None):
-            user_input.problem_definition(json_data.get('problem_type'))
+        if (json_data.get('problem_short_description') is not None):
+            user_input.problem_short_description(json_data.get('problem_short_description'))
         #user_input.evaluation_metrics(evaluation_metrics)
         #user_input.model(model)
-
-        return self.node_.start_task(task_id, user_input)
+        # TODO add missing fields
+
+        # Prepare extra data
+        hw_req = utils.default_hw_requirement
+        mem_footprint = utils.default_mem_footprint
+        if (json_data.get('hardware_required') is not None):
+            hw_req = json_data.get('hardware_required')
+        if (json_data.get('max_memory_footprint') is not None):
+            mem_footprint = json_data.get('max_memory_footprint')
+
+        # Add extra data to user user_input
+        extra_data = {'hardware_required': hw_req,
+                      'max_memory_footprint': mem_footprint}
+        json_obj = utils.json_dict(extra_data)
+        data_array = np.frombuffer(json_obj.encode(), dtype=np.uint8)
+        user_input.extra_data(sustainml_swig.uint8_t_vector(data_array.tolist()))
+
+        if self.node_.start_task(task_id, user_input):
+            return task_id
+        else:
+            return None
diff --git a/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/utils.py b/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/utils.py
index 45b2ce9..a3e6ed2 100644
--- a/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/utils.py
+++ b/sustainml_modules/sustainml_modules/sustainml-wp5/orchestrator_node/utils.py
@@ -14,8 +14,10 @@
 """SustainML Orchestrator Node utility methods."""
 
 from enum import Enum
-from sustainml_swig import AppRequirements, CO2Footprint, HWConstraints, HWResource, MLModelMetadata, MLModel
-import sustainml_swig
+import json
+
+default_hw_requirement = "PIM_AI_1chip"
+default_mem_footprint = 100
 
 class node_id(Enum):
     APP_REQUIREMENTS = 0
@@ -57,21 +59,23 @@ def string_status(status):
 
 def string_node(node):
     if node == node_id.APP_REQUIREMENTS.value:        # ID_APP_REQUIREMENTS
-        return "Application-level requirements"
+        return "APP_REQUIREMENTS"
     elif node == node_id.CARBONTRACKER.value:         # ID_CARBON_FOOTPRINT
-        return "Carbontracker"
+        return "CARBON_FOOTPRINT"
     elif node == node_id.HW_CONSTRAINTS.value:        # ID_HW_CONSTRAINTS
-        return "HW Constraints for inference"
+        return "HW_CONSTRAINTS"
     elif node == node_id.HW_PROVIDER.value:           # ID_HW_RESOURCES
-        return "HW Provider"
+        return "HW_RESOURCES"
     elif node == node_id.ML_MODEL_METADATA.value:     # ID_ML_MODEL_METADATA
-        return "ML Model Metadata"
+        return "ML_MODEL_METADATA"
     elif node == node_id.ML_MODEL_PROVIDER.value:     # ID_ML_MODEL
-        return "ML Model Provider"
-    elif node == node_id.ORCHESTRATOR.value:          # ID_ORCHESTRATOR (MAX is ID 6)
-        return "Orchestrator"
+        return "ML_MODEL"
+    elif node == node_id.MAX.value:                   # MAX
+        return "MAX"
+    elif node == node_id.ORCHESTRATOR.value:          # ID_ORCHESTRATOR
+        return "ORCHESTRATOR"
     else:
-        return "Unknown node"
+        return "UNKNOWN"
 
 def string_std_vector(vector):
     output = ""
@@ -84,6 +88,14 @@ def string_std_vector(vector):
         output += str(vector[i])
     return output
 
+def task_json(task_id):
+    return {"problem_id": task_id.problem_id(), "iteration_id": task_id.iteration_id()}
+
 def string_task(task):
     return "{" + str(task.problem_id()) + ", " + str(task.iteration_id()) + "}"
 
+def json_dict(dict):
+    return json.dumps(dict, indent=4)
+
+def dict_from_json(json_obj):
+    return json.loads(json_obj)
diff --git a/sustainml_swig/src/swig/sustainml_swig/nodes/OrchestratorNode.i b/sustainml_swig/src/swig/sustainml_swig/nodes/OrchestratorNode.i
index 985235c..3608ae4 100644
--- a/sustainml_swig/src/swig/sustainml_swig/nodes/OrchestratorNode.i
+++ b/sustainml_swig/src/swig/sustainml_swig/nodes/OrchestratorNode.i
@@ -170,6 +170,13 @@
         }
         return task_id;
     }
+
+    types::TaskId* set_task_id(
+        const uint32_t& problem_id,
+        const uint32_t& iteration_id)
+    {
+        return new types::TaskId(problem_id, iteration_id);
+    }
 %}
 
 // Include the class interfaces
diff --git a/sustainml_swig/src/swig/sustainml_swig/types/types.i b/sustainml_swig/src/swig/sustainml_swig/types/types.i
index 7567c10..0a86605 100644
--- a/sustainml_swig/src/swig/sustainml_swig/types/types.i
+++ b/sustainml_swig/src/swig/sustainml_swig/types/types.i
@@ -23,7 +23,7 @@
 %include std_string.i
 
 // Ignore overloaded methods that have no application on Python
-// Warnings regarding equiality operators and stuff
+// Warnings regarding equality operators and stuff
 %ignore *::operator=;
 %ignore operator<<;
 
@@ -31,5 +31,15 @@
 #include <sustainml_cpp/types/types.hpp>
 %}
 
+%extend std::vector<uint8_t>
+{
+    const uint8_t* get_buffer() const
+    {
+        return self->data();
+    }
+}
+
+%template(uint8_t_vector) std::vector<uint8_t>;
+
 // Include the class interfaces
 %include <sustainml_cpp/types/types.hpp>