Open Source IoT Hardware Platform

Functional Block Diagram

Step 1 Make the connection as shown in the above diagram

Step 2 copy the code and change the required parameter .

Step 3 Execute code  

Step 4  watch the expected result at Cloud MQTT server.

Test Setup 

Accessing VFD through MODBUS and updating clouds  Via MQTT GPRS code for your reference 

#include <IndinoDI.h>  // Indino Library 

/*     Cloud initialisation      */

char data1[20];

char* host = "m16.cloudmqtt.com";

//char* host = "52.3.184.147";

char* port = "16997";

char* username = "eoszmzsz";

char* password = "at1yeUD1pERj";

char* topic = "VFD";

char *APN = "www"; //bsnl

/*    Modbus initialisation       */

uint8_t funCode = 0x04; //Read holding register

uint8_t slave_id = 1; //Set the slave id

uint16_t start_addr = 16130; //Address to read frequency of the VFD    

uint16_t len = 2; //Datatype is 32-bit Float for MFR 2810

uint16_t data[2] = {0};

uint8_t freq_hex_bytes[4] = {0};

float frequency = 0;

uint32_t VALUE;

void setup()

{

Serial.begin(9600);

Serial3.begin(9600);

Indino_Modbus_Master_Init(); //Modbus initialisation

delay(2000);

pinMode(41, OUTPUT);

delay(2000);

Serial.println("Start..");

power_on(APN); //Switch on the modem

delay(1000);

}

/* Main Loop */

void loop()

{

start_addr=start_addr-1;

Indino_Modbus_Master_Read_Raw(funCode, slave_id, start_addr, len, data); //Modbus reading

Serial.print(data[0]);

Serial.println(" Hz");

sprintf(data1,"Frequency=%iHz",data[0]);

Indino_GPRS_Upload_MQTT(data1, APN, host, port, username, password, topic); //Uploading data to cloud using MQTT

delay(3000); // Delay

}