This Section illustrates the Client Side and Server side RPC (Remote Procedure Call) in ThingsBoard IoT Platform. Client_Side_RPC.py : This program will illustrates the Client side, RPC Server_Side_RPC.py : This Program will illustrates the Server side RPC and Temperature_Controller_Server_Side_RPC.py : This program illustrates Server side RPC u…

Client_Side_RPC.py

# This Program illustrates the Client Side RPC on ThingsBoard IoT Platform
# Paste your ThingsBoard IoT Platform IP and Device access token
# Client_Side_RPC.py : This program will illustrates the Client side
import os
import time
import sys
import json
import random
import paho.mqtt.client as mqtt

# Thingsboard platform credentials
THINGSBOARD_HOST = 'Paste your ThingsBoard IP'
ACCESS_TOKEN = 'Paste your Device Access Token Here '
request = {"method": "getemail", "params": ""}

# MQTT on_connect callback function
def on_connect(client, userdata, flags, rc):
    print("rc code:", rc)
    client.subscribe('v1/devices/me/rpc/response/+')
    client.publish('v1/devices/me/rpc/request/1',json.dumps(request), 1)

# MQTT on_message caallback function
def on_message(client, userdata, msg):
    print('Topic: ' + msg.topic + '\nMessage: ' + str(msg.payload))

# start the client instance
client = mqtt.Client()

# registering the callbacks
client.on_connect = on_connect
client.on_message = on_message

client.username_pw_set(ACCESS_TOKEN)
client.connect(THINGSBOARD_HOST, 1883, 60)

try:
    client.loop_forever()

except KeyboardInterrupt:
    client.disconnect()

Server_Side_RPC.py

# This Program illustrates the Simple Server Side RPC on ThingsBoard IoT Platform
# Paste your ThingsBoard IoT Platform IP and Device access token
# RPC Server_Side_RPC.py : This Program will illustrates the Server side RPC
import os
import time
import sys
import json
import random
import paho.mqtt.client as mqtt

# Thingsboard platform credentials
THINGSBOARD_HOST = 'Paste your ThingsBoard IP'
ACCESS_TOKEN = 'Paste your Device Access Token Here'
button_state = {"enabled": False}

def setValue (params):
    button_state['enabled'] = params
    print("Rx setValue is : ",button_state)

# MQTT on_connect callback function
def on_connect(client, userdata, flags, rc):
    print("rc code:",rc)
    client.subscribe('v1/devices/me/rpc/request/+')
    
# MQTT on_message caallback function
def on_message(client, userdata, msg):
    print('Topic: ' + msg.topic + '\nMessage: ' + str(msg.payload))
    if msg.topic.startswith('v1/devices/me/rpc/request/'):
        requestId = msg.topic[len('v1/devices/me/rpc/request/'):len(msg.topic)]
        print("requestId : ",requestId)
        data = json.loads(msg.payload)
        if data['method'] == 'getValue':
            print("getvalue request\n")
            print("sent getValue : ",button_state)
            client.publish('v1/devices/me/rpc/response/'+requestId, json.dumps(button_state), 1)
        if data['method'] == 'setValue':
            print("setvalue request\n")
            params = data['params']
            setValue(params)
            client.publish('v1/devices/me/attributes', json.dumps(button_state), 1)

# start the client instance
client = mqtt.Client()

# registering the callbacks
client.on_connect = on_connect
client.on_message = on_message

client.username_pw_set(ACCESS_TOKEN)
client.connect(THINGSBOARD_HOST,1883,60)

try:
    client.loop_forever()

except KeyboardInterrupt:
    client.disconnect()

Temperature_Controller_Server_Side_RPC.py

# This Program illustrates the Server Side RPC on ThingsBoard IoT Platform
# Paste your ThingsBoard IoT Platform IP and Device access token
# Temperature_Controller_Server_Side_RPC.py : This program illustrates Server side RPC using a Simulated Temperature Controller
import os
import time
import sys
import json
import random
import paho.mqtt.client as mqtt
from threading import Thread

# Thingsboard platform credentials
THINGSBOARD_HOST = 'Paste your ThingsBoard IP'       #Change IP Address
ACCESS_TOKEN = 'Paste your ThingsBoard Device Access Token'
sensor_data = {'temperature': 25}

def publishValue(client):
    INTERVAL = 2
    print("Thread  Started")
    next_reading = time.time()
    while True:
        client.publish('v1/devices/me/telemetry', json.dumps(sensor_data),1)
        next_reading += INTERVAL
        sleep_time = next_reading - time.time()
        if sleep_time > 0:
            time.sleep(sleep_time)

def read_temperature():
    temp = sensor_data['temperature']
    return temp

# Function will set the temperature value in device
def setValue (params):
    sensor_data['temperature'] = params
    #print("Rx setValue is : ",sensor_data)
    print("Temperature Set : ",params,"C")

# MQTT on_connect callback function
def on_connect(client, userdata, flags, rc):
    #print("rc code:", rc)
    client.subscribe('v1/devices/me/rpc/request/+')

# MQTT on_message callback function
def on_message(client, userdata, msg):
    #print('Topic: ' + msg.topic + '\nMessage: ' + str(msg.payload))
    if msg.topic.startswith('v1/devices/me/rpc/request/'):
        requestId = msg.topic[len('v1/devices/me/rpc/request/'):len(msg.topic)]
        #print("requestId : ", requestId)
        data = json.loads(msg.payload)
        if data['method'] == 'getValue':
            #print("getvalue request\n")
            #print("sent getValue : ", sensor_data)
            client.publish('v1/devices/me/rpc/response/' + requestId, json.dumps(sensor_data['temperature']), 1)
        if data['method'] == 'setValue':
            #print("setvalue request\n")
            params = data['params']
            setValue(params)

# create a client instance
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set(ACCESS_TOKEN)
client.connect(THINGSBOARD_HOST,1883,60)

t = Thread(target=publishValue, args=(client,))


try:
    client.loop_start()
    t.start()
    while True:
        pass

except KeyboardInterrupt:
    client.disconnect()

I am trying to acheive a simple task, however i am confused because its not working. After watching your tutorial, I am trying the code below but i am not getting desired results. I want to turn the knob (Knob widget in Thingsboard) and plot the value set by knob. For instance, rotate the knob and show the value of knob on chart/card etc. The script is below, can you help me to identify where i am doing wrong?

#!/usr/bin/env python
import os
import time
import smbus
import sys
import paho.mqtt.client as mqtt
import json

THINGSBOARD_HOST = 'ourdevice.tk'
ACCESS_TOKEN = 'iJqpMTIULqzlMgU2QpAw'

def on_connect(client, userdata, rc):
client.subscribe("v1/devices/me/rpc/request/+")

def on_message(client, userdata, msg):
data = json.loads(msg.payload)
data = int (data)
client.publish('v1/devices/me/telemetry', data)

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set(ACCESS_TOKEN)
client.connect(THINGSBOARD_HOST, 1883, 60)

try:
client.loop_forever()
except KeyboardInterrupt:
sys.exit()