send string via RF

Projects Programming
1

Hello,

As from Arduino IDE 0022, we can use standard strings.

For sending via RFM12, I've defined the following 'payload structure':
datatype struct
{
string sensor;
int value1;
int value2;
long value3;
} Payload;
Payload payload;

string sensorTMP1={"TOG04"};

I set the payload.sensor=sensorTMP1

When I want to send the payload, the send command hangs on the rf12_sendStart(0,&payload,sizeof payload,2); (using the jeenode RFM12 library).
I assume it has something to do with the string datatype in the payload structure, because when I send only int, float or chars it works.

Is there a simple way to solve this and still has the advantage using a string datatype ?

Thanks in advance,
Jeroen.

2

What is a "string datatype"? - you haven't defined one.

What "send command"?

3

Sorry for the mistake, I can't copy my real code at this moment.
Indeed, the declarations should be 'String' with a capital.
So I use the String constructor (not called a string datatype):

datatype struct
{
String sensor;
int value1;
int value2;
long value3;
} Payload;
Payload payload;

String sensorTMP1="TOG04";

The send command = rf12_sendStart(0,&payload,sizeof payload,2);

Thanks,
Jeroen.

4 
struct       
{
   String sensor;         
             int value1;
              int value2;
          long value3;
}

The String does not itself contain the string of characters, but only contains a pointer to another buffer. When you send this struct to the other side, it will arrive with a pointer to memory garbage. If you want to send the sensor value as a fixed length (and it will have to be fixed length) sequence of chars, then define your struct like this:

struct       
{
   char sensor[8];       // or whatever the maximum length is, plus one
   int value1;
   int value2;
   long value3;
}