Setting a device variable only when it changes: Implementing data streams.

[grandeurdev]

Setting a device variable only when it changes: Implementing data streams.

[instanceofMA]

What I mean is something like this:

data.pipe("state", state);

If the user does something like state = 1 (basically just updates the variable), sdk detects the update and if it's different from the previous value, it calls data.set("state", /* New State Value */). And when an update occurs on Grandeur we simply put the new value into the state variable.

My idea is to implement this with references.

map allVariableReferences;
map allVariableValues;

data.pipe(String path, Var& reference) {
  allVariableReferences[path] = reference;
}

project.loop() {
  // Check all references to see if any of their values is updated and call data.set
  // for any variable that is.
  allVariableReferences.forEach([=](String path, Var& reference) {
    if(allVariableValues[path] != reference) {
      data.set(path, reference);
      allVariableValues[path] = reference;
    }
  });
}

/** when update packet is received */
allVariableReferences[payload["event"] + "/" +payload["path"]] = payload["data"];