Pubnub Subscribe error

Feature Requests & Bug Reports
1

Hi, I try to use simple Pubnub Subscribe and extract json from it:

`pubnub.subscribe([ledStateChannel], function(err, result, tt) {
    if(result != null && ledStateChannel in result) {
        try {
            local data = http.jsondecode(result[ledStateChannel]);
            if ("light" in data) {
                device.send("led", data["led"].tointeger());
            }
        } catch(ex) {
            server.log("Error - " + ex);
        }
    }
});`

but the ‘result’ never contain json string (I did check on pubnub debug console having correct message), rather than the ‘result’ contains something like a reference to a table when I do server.log on it:

`2016-03-11 11:45:39 UTC+0	[Agent]	(table : 0x7f604cce39d0)
2016-03-11 11:45:39 UTC+0	[Agent]	Error - Invalid JSON (line 22)`

Any idea?

2

why not just print it to see what it is?

server.log("type="+typeof(result[ledStateChannel]+" result="+result[ledStateChannel])

3

Ah I did print the result[ledStateChannel] and the content is (table : 0x7f604cce39d0)

4

and the type is ‘table’
type=table result=(table : 0x7f33b86e0270)

Or should I ask PubNub?

5

Reading the pubnub class documentation…
// Subscribe to one or more channels // Input: // channelsArray - array of channels to subscribe to // callback - onData callback with three parameters: // err - A string containing the error, or null on success // result - A table containing (channel, value) pairs for each message // timetoken - nanoseconds since UNIX epoch, (from PubNub service) // [timetoken] - callback with any new value since (timetoken). // // NOTE1: The callback will be initially called once with result = {} and tt = 0 after first subscribing // NOTE2: Subscribe should generally be called with the timetoken parameter ommited

result is a table. ie it has already been json decoded for you.

6

Thanks! it works. The table can be directly accessed:

`if ("led" in (result[ledStateChannel])) {
    device.send("led", result[ledStateChannel]["led"].tointeger());
    server.log("Send - " + result[ledStateChannel]["led"]);
}`

Then the result:

`2016-03-15 06:25:10 UTC+0	[Agent]	type=table  result=(table : 0x7f336dcd08d0)
2016-03-15 06:25:10 UTC+0	[Agent]	Send - 1
2016-03-15 06:25:12 UTC+0	[Agent]	type=table  result=(table : 0x7f33c88fd250)
2016-03-15 06:25:12 UTC+0	[Agent]	Send - 0`