DIO change status not received in python

Python
1

hi ,
i have 2 xbee S1 linked , send receive is ok via xctu and my python program .the only issue is my push button (connected to one of the xbees set in DIOo) when pressed i get the api frame (change detect) via xctu but not in my python program , althought it’s a loop listening for all incoming data (i have tried a basic python serial listen port is ok and also all kind of terminals are receiving the data)

XBee setup

    self.serial_port = "COM10"  
    self.xbee_device = XBeeDevice(self.serial_port, 1200)
def start_xbee(self):
    try:
        self.xbee_device.open()


        print("Device serial port opened successfully.")
        print("Waiting for data...")

        while True:

            xbee_message = self.xbee_device.read_data()
2

It does not look like you are looking for Hex data packets.

3

xbee_device.read_data() suppose to receive any kind of data (it works with sending manually frame from xctu) the only data i don’t receive is when change detect of the remote xbee occurs (even i see the same data from other apps (xctu, terminal, and even pyserial))
the pb is for sure the way the library xbee_device.read_data() works (maybe flow control) i dont know really i’m stuck

4

What library are you using?

Do you have AP set on the radio for 1 or 2?

5

import digi.xbee.devices
all api is set and works (checkked with xctu)

6

Tewfik,

What Library are you using to obtain the function “xbee_device.read_data()”? Where did you obtain it from?

7

digi-xbee version 1.4.1
i use pycharm with python 3.12 and my pyserial 3.5
all updated

8

https://xbplib.readthedocs.io/en/latest/user_doc/communicating_with_xbee_devices.html?highlight=read_data()#polling-for-data
I don’t know if you are already doing this, but you need to have the read_data in a loop as the DIO data will be sent as an Asynchronous function.

9

yes i do
# XBee setup
self.serial_port = “COM10” # Replace with your port
self.xbee_device = XBeeDevice(self.serial_port, 1200)
def start_xbee(self):
try:
self.xbee_device.open()

        print("Device serial port opened successfully.")
        print("Waiting for data...")

        while True:

            xbee_message = self.xbee_device.read_data()


            if xbee_message:


                    deviceid = str(xbee_message.remote_device.get_64bit_addr())

                    rssi_bytearray = xbee_message.remote_device.get_parameter("DB")
                    rssi = int.from_bytes(rssi_bytearray, byteorder='big')  # Convert bytearray to int

                    print(f'Message from ID: {deviceid}, RSSI: {rssi}')
      time.sleep(0.1)
    except Exception as e:
        print("Error:", e)
10

Is there a specific reason you are trying to run at a 1200 baud rate and not something like 9600 or 115.2kbps?

11

No I was running basically with 57600 then I tried many rates (including 9600) to see if reducing baud rate will fix that
Anyway the com is working fine since with the same code I receive api if I send it manually with xctu only dio change detect api ( tx 83) is not working while this same api is received if I use terminal or serial read ()

12

It seems your Python program isn’t capturing the API frames from the XBee when the push button is pressed. Here are some quick tips to troubleshoot:

  1. Ensure API Mode: Make sure your XBee is set to API mode, as it won’t send API frames in AT mode.
  2. Check Data Handling: Verify that your loop correctly processes the incoming data, especially for change detect frames.
  3. Add Debugging: Include print statements to log incoming data, which can help identify if messages are being received but not processed.

These steps should help you resolve the issue.

13

This sounds like you have not set the Change Detect function in the radios firmware to the correct values.