Req Body auto change issue

Tools & SDKs
1

Hi All,

I’m trying to read the ESP32 data in the form of JSON with pyserial and revert the same JSON back to the notecard with the same python script. But I can see some error logs. It seems some \ symbols added in between the data. In my Req there is no \ symbols.

Python Script:

import json
import notecard
import serial
import time

productUID = "com.gmail.pradeeplogu26:blues_wio_anomaly_detector"

if __name__ == '__main__':
    ser = serial.Serial('COM22', 115200, timeout=1)
    ser.flush()
    serial = serial.Serial('COM7', 9600)
    card = notecard.OpenSerial(serial, debug=True)

    req = {"req": "hub.set"}
    req["product"] = productUID
    req["mode"] = "continuous"
    card.Transaction(req)

    while True:
        if ser.in_waiting > 0:
            line = ser.readline().decode('utf-8').rstrip()
            print("Serial Data is" + str(line))
            req = {"req": "note.add"}
            req["file"] = "sensors.qo"
            req["start"] = True
            req["body"] = str(line)
            print("Req is : " + str(req))
            card.Transaction(req)
            time.sleep(5)

Error Log: b’{“err”:“body: unmarshal: field body expects object_raw {io}”}’

image
image1271×196 11 KB

eventhough I tried to replace " with ’ in the received JSON but the issue remains same.

image
image1268×130 6.3 KB

2

Hi @Pradeep,

The backslashes are escape characters to allow for a proper display of JSON output. Check out this Stack Overflow post on a similar issue. I haven’t tested this, but my guess is this will help solve your problem:

json_data = json.dumps(response_read)
json_without_slash = json.loads(json_data)
3

Hi Rob,

Thanks for the help, I tried to load the JSON and again send to notecard now the return response doesn’t contain backslash, and it’s working.

import json
import notecard
import serial
import time

productUID = ""

if __name__ == '__main__':
    ser = serial.Serial('COM22', 115200, timeout=1)
    ser.flush()
    serial = serial.Serial('COM7', 9600)
    card = notecard.OpenSerial(serial, debug=True)

    req = {"req": "hub.set"}
    req["product"] = productUID
    req["mode"] = "continuous"
    card.Transaction(req)

    while True:
        if ser.in_waiting > 0:
            line = ser.readline().decode('utf-8').rstrip()
            json_without_slash = json.loads(line)
            print("Serial Data is " + str(json_without_slash))
            
            req = {"req": "note.add"}
            req["file"] = "sensors.qo"
            req["start"] = True
            req["body"] = json_without_slash
            
            print("Req is : " + str(req))
            card.Transaction(req)
            time.sleep(5)
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