HTTPIN with JSON data

Squirrel Code
1

I have a PHP script posting JSON data to my Electric Imp the following way:

My PHP is:
`

<?php $url = 'http://myImpURL.com'; $myjson = '{"column1":"1","colum2":"2","column3":"3","column4":"4","column5":"5","column6":"6"}'; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, $myjson); $result = curl_exec($ch); curl_close($ch); ` My Electric Imp: ` // Connect to server imp.configure("Serial RX", [TableIn], []); //Function that waits to receive data class TableIn extends InputPort { function set(v){ data = v.tostring(); server.log(data); } } ` "server.log(data);" only prints the first value" 1", instead of the full JSON data. How do I access data from Column2-6? I've tried `server.log(v.column2);` as in the tutorial, but since the JSON data isn't a table, it doesn't work.
2

You should avoid using HTTP In nodes + Input Ports, and take a look at http.onrequest instead

You would change your code to look something like this:

http.onrequest(function(request, response) { try { local data = http.jsondecode(request.body); if ("column1" in data) { server.log(data.column1); } // ... } catch (ex) { resp.send(500, "Internal Server Error: " + ex); } });

3

When I use my agent URL (https://agent.electricimp.com/fGMi6u__LBdg), the page just loads indefinitely (over several minutes) and thus never calls http.ondemand.

4

Oh, nevermind, it just called it. The connection was just REALLY slow (I just retimed it and it took 60 sec).

5

Whoops - actually that’s partially my bad.

If you call the agent URL and don’t have a resp.send() the only time it will return is when it times out.

Here’s what the code should look like:

`http.onrequest(function(request, response) {
try {
local data = http.jsondecode(request.body);
if (“column1” in data) {
server.log(data.column1);
}
// …

// when you're done:
resp.send(200, "OK"); // this is a pretty standard response

}
catch (ex) {
resp.send(500, "Internal Server Error: " + ex);
}
});`

6

Okay. That fixed it. Thanks:)

7

I’m trying to do something similar, send 4 values from an iOS app to the imp. If I use http.onrequest, that code goes in the agent, and you are saying that I wouldn’t attach an HTTP-In on the planner?

8

http.onrequest goes in the agent. If you need to pass values from the incoming http request to the device (you probably do) - you would do so with a device.send / agent.on:

Agent Code
`http.onrequest(function(request, response) {
try {
local data = http.jsondecode(request.body);
// make sure we got all the values we’re expecting
if (“column1” in data && “column2” in data && “column3” in data && “column4” in data) {
device.send(“HttpData”, data);
resp.send(200, “OK”);
}

resp.send(500, "Missing Data in Body");

}
catch (ex) {
resp.send(500, "Internal Server Error: " + ex);
}
});`

Device Code
agent.on("HttpData", function(data) { //do something with data.. maybe write out to pins or something pin1.write(data.column1); pin2.write(data.column2); pin5.write(data.column3); pin7.write(data.column4); });

9

Thanks, I do need to. I pretty much figured out the device-agent communication last night, but I need to program it a few times to get it in my head.