Archived Forum

I don't know how to phrase this but let's give it a go...

I now have a small sketch that is publishing values via RFM69 to the emonPi.

I have the following definition...

[[27]]
    nodename = AKO-15722
    firmware = modbus1
    hardware = ako-15722
    [[[rx]]]
       names = t1,t2,t3,t4,t5,t6,t7,t8,t9,t10
       datacode = h
       scales = 0.1,0.1,0.1,0.1,0.1,0.1,0.1,0.1,0.1,0.1,
       units = C,C,C,C,C,C,C,C,C,C

and on the client side I am populating...

typedef struct {                                                      // RFM12B RF payload datastructure
  int temp[10];
} Payload;

So far so good.  I can send temperature values back, sending actual measurement * 10 which is perfect as that's what I receive from the datalogger.

However, Currently I have only 2 out of the 10 probes configured and hence I have good measurements for temp[0] and temp[1] but the others have bogus values.

Is it possible to indicate somehow that a value is missing on the client?  I guess I need a magic number?

At the moment I send a non-sense value 1200C but really I want a way of indicating if a value is present rather than a silly value.  Zero definitely isn't a good value since that might be an actual good value.

Is there a way of indicating nulls?

Thanks in advance

Nivag