How to query the status of a pin?

Squirrel Code
1

I’m new to the imp and I’m trying to do something that I thought you be fairly simple.

I’m trying to have an agent that retrieves the value of the state of a pin and respond with the value in the body of the response. But I cannot accomplish this, it seems the only way to do this is to send a message to the device and have a listener in the agent but that basically prevents me from replying with the value in the same transaction.

I’m hoping this is an easy one.

Rgds

2

This example is will show you how to write to a pin using the agent.
https://electricimp.com/docs/gettingstarted/3-agents/

In your case, you want to read a pin, so you could do something like this at the device:
local pin9State = hardware.pin9.read() (Assuming you were using Pin 9), and then send it to the agent, where you would respond back to your request.

3

There’s two common ways of doing this.

The first is the have the device update the agent whenever the state of the pin changes:

Device Code
function pinChanged() { agent.send("pin1", hardware.pin1.read()); } hardware.pin1.configure(DIGITAL_IN, pinChanged);

Agent Code
`_pin1 <- null;
device.on(“pin1”, function(pin1State) {
_pin1 = pin1State;
}

http.onrequest(function(req, resp) {
resp.send(200, http.jsonencode({ pin1 = _pin1 }));
});`

The other is using the method described in this post