Picoweb: Receiving data via JSON POST from another client...

[netsrac]

Hi,

I thought this was simple., but I already spend some time without any success. I have a client that sends data via a JSON POST request. I want to receive this data from my ESP32 running Picoweb and later display the content on the attached screen.

I got Picoweb up and running and all GET requests are working fine.

I replicated the client's request by a simple curl call:

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curl -H "Content-Type: application/json" -H "Accept: application/json" -H "Content-Length: 155" -X POST -d '{"pressure": 997, "voltage": 12.184, "mintemp": 27.7, "humidity": 26, "temperature": 29.4, "ts": 1591796818, "trend": 0, "maxtemp": 30.0, "hallsensor": 46}' http://192.168.42.192/batteryslave

Here is my Webserver code:

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def index(req, resp):
    method = req.method
    print("Method was:" + method)
    yield from picoweb.start_response(resp)
    yield from resp.awrite("Hello world from picoweb running on the ESP32")

def batteryslave(req, resp):
    method = req.method
    print("Method was:" + method)

    if req.method == "POST":
        size = int(req.headers[b"Content-Length"])
        print("Size: ", size)
        yield from req.read_form_data()
    else:
        req.parse_qs()

    yield from picoweb.start_response(resp)
    yield from resp.awrite("OK")
    yield from resp.awrite("\r\n")

    print(req.headers)

ROUTES = [
            ("/", index),
            ("/batteryslave", batteryslave)
         ]
         
app = picoweb.WebApp(__name__, ROUTES)
app.run(debug=2, port = 80, host = "192.168.42.192")

So if I call http://192.168.4.1/batteryslave via method GET (e.g. via curl), I go get the expected response "OK". That proved me that the function ist correctly called. Now I try the JSON POST via the above curl command.

I instantly get a "Connection reset by peer" and picweb is throwing an error: "AttributeError: 'Stream' object has no attribute 'readexactly'" which is caused by the req.read_form_data().

So now I put a comment in front of the "read_form_data" I go get all my debug information:

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INFO:picoweb:645119762.421 <HTTPRequest object at 3ffe5fd0> <Stream object at 3ffe5dd0> "POST /batteryslave"
Method was:POST
Size:  155
{b'Accept': b'application/json', b'User-Agent': b'curl/7.64.0', b'Host': b'192.168.42.192', b'Content-Type': b'application/json', b'Content-Length': b'155'}
DEBUG:picoweb:645119762.421 <HTTPRequest object at 3ffe5fd0> Finished processing request

but still the "OK" reply is not received by the client and I get the "Connection reset by peer".

So how do I read the raw data, so that I can decode the json data?

And how do I send a reply back to the client, so that he know everything was successful.

Thanks...