/* DESC: This Script reads a temperature at a modbus sensor and send a alarm in case a threshold temp is reached
 * Copyright (C) 2017 NetModule AG, Switzerland
 */

// Email Setting
EMAILTO="my@alarm.de";
EMAILSUBJECT="Temperature Alarm";

//Alarming Setting
//lets Monitor a fridge
MAXTEMP=7; 

//The Modbus Sensor we read from
MBHOST="192.168.1.253";
MBPORT=502;
// The Register to read from
MBREGISTER=1;


 
 
sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock < 0) {
    print("unable to open socket\n");
    exit(1);
}
 
if (connect(sock, MBHOST, MBPORT) < 0){
    printf("Could not connect to %s (port %d)\n", MBHOST, MBPORT);
    close(sock);
    exit(1);
}

// Register the socket to the Modbus subsystem
nb_modbus_register(sock,MODBUS_TYPE_TCP);

// Get the Value from Modbus Sensor, we only request 1 address
payload=nb_modbus_read_input_regs(sock, MBREGISTER,1);
if (length(payload)==1) {
    // lets devide the Temperatur by 10 to get a float value
    temp=(float) payload[0] / 10;
    if (temp>MAXTEMP) {
        nb_syslog("We have a high temperature: %2.2f° C. Sending alarm email",temp);   
        ret = nb_email_send(EMAILTO, EMAILSUBJECT, sprintf("Alarm. Temperatur is to high: %2.2f° C",temp));
        if (ret == 0) {
            nb_syslog("Successfully sent E-Mail to %s", EMAILTO);
        } else {
            nb_syslog("Unable to send E-Mail");
        }

}


  }
nb_modbus_unregister(sock);
close(sock);    
exit(0);