Select Resource is not avaiable in RPI-3

I am trying to use thinger in RPI-3
I have followed the basic tutorial.
When I try to create a dashboard, the Select Resource option does not appear.

Anybody has the same problem?

Hi, the basic example for RPI3 does not add any output resource, so you cannot plot any information on the dashboard by default. Try to add a sample output resource, like the following, that will generate a random number:

  thing["random"] >> (pson& out){
        out = rand(); // or just a fixed number (out = 3;)

You many need to include the following header for using rand.

#include <stdlib.h> 

Hope it helps!


I had the same doubt, and i tried the example that you wrote, but when i compile the coding i get some errors.

My code:

#include "thinger/thinger.h"
#include <stdlib.h>

#define USER_ID             "asdasd"
#define DEVICE_ID           "asdasd"
#define DEVICE_CREDENTIAL   "asdasd"

int main(int argc, char *argv[])
    thinger_device thing(USER_ID, DEVICE_ID, DEVICE_CREDENTIAL);

    // define thing resources here. i.e, this is a sum example
    thing["sum"] = [](pson& in, pson& out){
        out["result"] = (int) in["value1"] + (int) in["value2"];
    thing["random"] >> (pson& out2){
        out2 = rand(); // or just a fixed number (out = 3;)
    return 0;

The errors:

/home/pi/Linux-Client/src/main.cpp: In function ‘int main(int, char**)’:
/home/pi/Linux-Client/src/main.cpp:39:29: error: expected primary-expression before ‘&’ token
thing[“random”] >> (pson& out2){
/home/pi/Linux-Client/src/main.cpp:39:31: error: ‘out2’ was not declared in this scope
thing[“random”] >> (pson& out2){
CMakeFiles/thinger.dir/build.make:62: recipe for target ‘CMakeFiles/thinger.dir/src/main.cpp.o’ failed
make[3]: *** [CMakeFiles/thinger.dir/src/main.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target ‘CMakeFiles/thinger.dir/all’ failed
make[2]: *** [CMakeFiles/thinger.dir/all] Error 2
CMakeFiles/Makefile2:79: recipe for target ‘CMakeFiles/thinger.dir/rule’ failed
make[1]: *** [CMakeFiles/thinger.dir/rule] Error 2
Makefile:118: recipe for target ‘thinger’ failed
make: *** [thinger] Error 2

Any help?

Sorry, the resource was wrong. It should be:

thing["random"] >> [](pson& out){
  out = rand(); // or just a fixed number (out = 3;)

Hope it helps!

Thanks :smiley:
It works
Now to find out hoy to read and write GPIO in C++

1 Like