Send a string as a value

[Meister_Petz]

Hi,

is there a way to send a string as the value of a message:

I would like to do that:

String test = String(sRead1) + "-" + String(sRead2)+ "-" + String(sRead3); // result: "20.5-1011-2.5"
gw.send(msg1.set(test));

I did not find a way to get "test" transformed (char, string,...) to get it sent. But interestingly this works:

gw.send(msg1.set("20.5-1011-2.5"));

so I think there should be a way to get "test" transformed in a format which can be sent.

Anyone any ideas?

Many Thanks!

[hek]

You should avoid using String on embedded systems (thus we do not have any send for it).

Have a look at strcpy.

[Meister_Petz]

do you have an example? Many Thanks!

[tekka]

@Meister_Petz you can always do something like this:

char Output[13];
String OutStr = String(sRead1) + "-" + String(sRead2) + "-" + String(sRead3);
OutStr.toCharArray(Output,13);
gw.send(msg.set(Output));

but as @hek pointed out, try avoiding it where possible...

[Meister_Petz]

@tekka
Many Thanks!
I'd like to avoid it, but I'm not a developer and so my programing skills are limited

[fets]

@Meister_Petz, you could simply write :

String OutStr = String(sRead1) + "-" + String(sRead2) + "-" + String(sRead3);
gw.send(msg.set(OutStr.c_str()));

[AWI]

Or just use the character arrays with snprintf

[Meister_Petz]

many thanks! I know it's easy for you - unfortunately not for me. That's why I'm here.