[Question] Gateway 2.2 Decimal/Real number input precision

[diverseg]

The Gateway 2.2 Decimal/Real number input precision
Maybe someone has thoughts on this
we are currently limited to 2 decimal places in the construction of the MQTT message

In the gateway file
RFM_MQTT_GW_22.ino

mes.fltVal is of type float

in the function

void processPacket()
.
.
.
if (RealMess) { // send decimal value
        dtostrf(mes.fltVal, 10,2, buff_mess);        //<---------'10' minimum string width/digits including '-' negative, decimal and white space. '2' decimal places   
        while (buff_mess[0] == 32) {                 // remove any leading spaces

                for (int i =0; i<strlen(buff_mess); i++) {

                    buff_mess = buff_mess[i+1];

                    }

                }

}     
.
.
.
I increased the decimal places to 4 and my plots/charts of sensitive(precision) data have smoothed up considerably

dtostrf(mes.fltVal, 10,4, buff_mess);            //<---------'10' minimum string width/digits including '-' negative, decimal and white space. '4' decimal places

I understand the precision required varies depending on the value being measured.

I just wanted to get others thoughts on this as to what are the consequences/limitations  
As far as I know in the typical arduino micro controller a float is only good to 6 decimal places.

Note:I believe the dtostrf internal buffer is limited to 20 characters as seen below

/* As of early June 2013, dtostrf is not implemented in the Arduino IDE 1.5 libraries -
but it will be implemented in the future. Use this function in the meantime
See forum.arduino.cc/index.php?topic=170564.0. */

char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
            char fmt[20];
            sprintf(fmt, "%%%d.%df", width, prec);
            sprintf(sout, fmt, val);
            return sout;
}