Shelly 4 PRO PM script

Zitat von rboldori

Hi All,

I am writing a script for the Shelly 4 PRO PM that is expected to collect status of each single switch and sum the voltage of the four switch.

When I try to get the status of a switch I noticed that:
a) the javascript steps are executed in a sequence I didn't expect (I expected steps 1, 2, 3 while they are executed as 1, 3, 2);

b) the status of the Shelly is only available within the scope of the callback function, and cannot be assigned to a binding outside the environment of the function, while I expected that the callback to be able to access the global scope. In other words: the parameter r cannot be assigned to r2.

Can someone explain the reason of the two issues? How can I use the result of the callback outside of the Shelly.call?

Please find below the code and the colole output.

Thanks

R

------------------------------------------------

let r2 = {temp:0, volt: 0};

let userdata2 = null;

print("Step 1 - r2:", JSON.stringify(r2));

let risultato = Shelly.call("Switch.GetStatus",

{"id": 0},

function (r, error_code, error_message, userdata1)

{

print("r:",JSON.stringify(r));

r2.temp = r.temperature.tC;

r2.volt = r.voltage;

print("Step 2 - r2:",JSON.stringify(r2));

return r;

},

userdata2);

print("Step 3 - r2", JSON.stringify(r2));

-----------------------------------------------

CONSOLE OUTPUT:

Step 1 - r2: {"volt":0,"temp":0} 17:04:39.523

Step 3 - r2 {"volt":0,"temp":0} 17:04:39.534

r: {"temperature":{"tF":84.600000,"tC":29.200000},"aenergy":{"minute_ts":0,"by_minute":[0.131000,0,0],"total":0},"pf":0,"current":0,"voltage":234.200000,"apower":0,"output":false,"source":"init","id":0} 17:04:39.616

Step 2 - r2: {"volt":234.200000,"temp":29.200000}

Alles anzeigen

Same behaviour, my console output is:

---

Step 1 - r2: {"volt":0,"temp":0}18:01:45.660

Step 3 - r2 {"volt":0,"temp":0}18:01:45.672

r: {"temperature":{"tF":105.700000,"tC":41},"aenergy":{"minute_ts":1642438904,"by_minute":[592.156000,788.928000,789.454000],"total":742.088000},"pf":-0.470000,"current":0.317000,"voltage":231.300000,"apower":46.500000,"output":true,"source":"init","id":0}18:01:45.757

Step 2 - r2: {"volt":231.300000,"temp":41}

---

I unfortunately have zero experience with ShellyPro Scripting, but want to get a similar (albeit slightly different) result as you are looking for -- I want a way to "ask" via http for the power consumption sum of all four meters, returned ideally via a JSON object.

But I don't really understand the syntax of the scripting and how I could then do a http request to get the summary from the device.. :-/ can you help, given that you're clearly ahead of me in regards to writing scripts?

Zitat

This works:

JavaScript

 let switchData = {
   temperature: 0,
   voltage: 0,
 };
 
 Timer.set(1000, true, function() {
   console.log(switchData.temperature, " - ", switchData.voltage);
 });
 
 Shelly.call(
   "Switch.GetStatus",
   {
     id:0
   },
   function(result) {
     switchData.temperature = result.temperature.tC;
     switchData.voltage = result.voltage;
   }
);

Alles anzeigen

Shelly Script is asynchronous as generally JavaScript is. As the code is single threaded, the ability to provide delayed execution is achieved via callbacks, invoked when a synchronous (Timers) or asynchronous(RPC, HTTP calls) events occur.

So in the provided example the printing of values outside of the callback happens before the callback is executed. If you need to use the results of the response call a function from within the callback.

Thanks Mircho. Do you have an idea if my request (summing up power utilization across channels and accessing this via http / rpc request) is somehow doable via the onboard scripting?