Event from PD to CP is not working

[MarosMotaj]

Hi All,

Thanks for great work. I try to sent event from PD (ATTiny3224) to CP (ESP32-WROOM32). I have no ERROR but the event will not be sent. I am using Platformio. Commands from CP to PD are working. Also RS485 communication is working on both sides. Can you please help me solve the problem ? Thank you for yours time.

void send_button_event(OSDP::PeripheralDevice &pd, uint8_t keycode) 
{
    Serial1.println("Button Pressed");

    pd.flush_events();

    osdp_event event;
    osdp_event *p_event = &event;
    
    p_event->type = OSDP_EVENT_KEYPRESS;
    p_event->keypress.reader_no = 0; // 0 - This device
    p_event->keypress.length = 1;    // Single key press
    p_event->keypress.data[0] = keycode; // Keycode of the pressed button

    // Set RS485 module to Transmit mode
    digitalWrite(RS485_DIRECTION_PIN, RS485_TRANSMIT);
    delayMicroseconds(200);
    
    // Notify the event
    if (pd.notify_event(p_event) == 0) {
        Serial1.println("Button event sent successfully.");
    } else {
        Serial1.println("Failed to notify button event.");
    }
    
    // Flush events and reset RS485 to Receive mode
    Serial0.flush();
    digitalWrite(RS485_DIRECTION_PIN, RS485_RECEIVE);
}

void loop() 
{
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval_2000) {
        previousMillis = currentMillis;
        send_button_event(pd, 0x30);
    }
    
    unsigned long previousDelayMillis = 0;
    if (currentMillis - previousDelayMillis >= interval_50) {
        previousDelayMillis = currentMillis;
        pd.refresh();
    }
}

[sidcha]

@MarosMotaj, the code snippets you have posted here is not enough to understand what might be going wrong. Can you post the entire code? if not, please setup a minimized but fully contained code.

Also posting the full logs would be helpful.

[MarosMotaj]

Hi, I changed ATtiny3224 to ESP32-WROOM32, and here are the LOG msg after start:

OSDP: PD-0:    osdp_pd.c:1142 [WARN ] SCBK not provided. PD is in INSTALL_MODE
osdp::pd:    osdp_pd.c:1161 [INFO ] PD Setup complete; LibOSDP-3.0.8 platformio
OSDP Control Panel initialized.

LOG after button press:

Button Pressed
OSDP: PD-0:    osdp_pd.c:101  [ERROR] Event slab allocation failed
Failed to notify button event.

I also uncommented commented PD capabilities

Thanks for help

[sidcha]

Okay, I think the issue is with the way you switch the RS485 transceiver direction in the event delivery method. When you notify the event, they are not directly sent to the CP but queued to be delivered at a later time. So the direction switches have to be entirely within the send/receive functions which are called when the library is ready to read/write data.

[MarosMotaj]

I commented direction switches:

void send_button_event(OSDP::PeripheralDevice &pd, uint8_t keycode) 
{
    Serial1.println("Button Pressed");

    //pd.flush_events();

    osdp_event event;
    osdp_event *p_event = &event;
    
    p_event->type = OSDP_EVENT_KEYPRESS;
    p_event->keypress.reader_no = 0; // 0 - This device
    p_event->keypress.length = 1;    // Single key press
    *(p_event->keypress.data + 0) = keycode; // Keycode of the pressed button
    
    //digitalWrite(RS485_DIRECTION_PIN, RS485_TRANSMIT);
    //delayMicroseconds(100);

    // Notify the event
    if (pd.notify_event(p_event) == 0) {
        Serial1.println("Button event sent successfully.");
    } else {
        Serial1.println("Failed to notify button event.");
    }
    
    // Flush events and reset RS485 to Receive mode
    //Serial0.flush();
    //delayMicroseconds(100);
    //digitalWrite(RS485_DIRECTION_PIN, RS485_RECEIVE);
}

but I still have error:

Button Pressed
OSDP: PD-0:    osdp_pd.c:101  [ERROR] Event slab allocation failed
Failed to notify button event.

If I use "pd.flush_events()" in "send_button_event(...)" method the error disappears, but no event is send to CP. When the event is send ? It is send automatically after "cp.refresh()" call method in CP main loop?

[sidcha]

The events are sent out the next time the CP sends a POLL command. This happens when you call the refresh method but there is no 1-1 correlation between those actions — so best is to not rely on it.

The event queue depth is only 4. So if there was something else that got into the queue before this event (or more such button press event) then you can exhaust the queue easily and hit this issue. Ensure the CP is alive and well when you queue the event.

[MarosMotaj]

Ok, the error appears after 3 times button is press so I use "pd.flush_events();" after "send_button_event(pd, 0x30);" and the error disappears :) but CP display no event. I use this method in CP:

// Event handler for the Control Panel
int event_handler(void *data, int pd, struct osdp_event *event) {
    (void)(data);
    Serial.print("PD");
    Serial.print(pd);
    Serial.print(" EVENT: ");
    Serial.println(event->type);

    if (event->type == OSDP_EVENT_KEYPRESS) {
        Serial.println("Keypress Event Received.");
    }

    return 0;
}

and in the:

void setup() { 
cp.set_event_callback(event_handler, nullptr);
.
.
}

[sidcha]

@MarosMotaj After a fair bit of thought, I think this has to be something related to your setup and not a LibOSDP bug. I am relying on the tests that cover this specific case to make that claim.

So the best I can do here is to give you suggestions to debug the issue:

• Isolate the problem
  • run a python CP program to interact with your PD directly connected using a USB-UART adapter
  • also, try to run a python PD program to debug your CP
• Try adding logs in LibOSDP code to understand the flow
• Turn-on packet capture on the python CP and share the caputre file here for further analysis

[MarosMotaj]

Ok I understand, thanks :)

[MarosMotaj]

Hi,

I try and I have this error results.
On CP side (RPi5):
pyosdp: 2025-04-06T07:57:08Z osdp_cp.c:1461 [INFO ] CP Setup complete; LibOSDP-3.0.8 master (8c334ad) NumPDs:1 Channels:1
OSDP: CP: PD-0: 2025-04-06T07:57:09Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (1)
OSDP: CP: PD-0: 2025-04-06T07:57:10Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (2)
OSDP: CP: PD-0: 2025-04-06T07:57:11Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (3)
OSDP: CP: PD-0: 2025-04-06T07:57:12Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (4)
OSDP: CP: PD-0: 2025-04-06T07:57:13Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (5)
OSDP: CP: PD-0: 2025-04-06T07:57:14Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (6)
OSDP: CP: PD-0: 2025-04-06T07:57:15Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (7)
OSDP: CP: PD-0: 2025-04-06T07:57:16Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (8)
OSDP: CP: PD-0: 2025-04-06T07:57:17Z osdp_cp.c:901 [ERROR] Response timeout for CMD: CHLNG(76)
OSDP: CP: PD-0: 2025-04-06T07:57:17Z osdp_cp.c:1153 [WARN ] SC Failed. Retry with SCBK-D
OSDP: CP: PD-0: 2025-04-06T07:57:17Z osdp_cp.c:901 [ERROR] Response timeout for CMD: CHLNG(76)
OSDP: CP: PD-0: 2025-04-06T07:57:17Z osdp_cp.c:1202 [INFO ] Online; Without SC
OSDP: CP: PD-0: 2025-04-06T07:57:18Z osdp_cp.c:901 [ERROR] Response timeout for CMD: LED(69)
OSDP: CP: PD-0: 2025-04-06T07:57:18Z osdp_cp.c:1210 [ERROR] Going offline for 300 seconds; Was in 'Online' state

code:

#!/usr/bin/env python3
#
#  Copyright (c) 2020-2024 Siddharth Chandrasekaran <sidcha.dev@gmail.com>
#
#  SPDX-License-Identifier: Apache-2.0
#

import time
import argparse
import serial
from gpiozero import OutputDevice
from osdp import *

class SerialChannel(Channel):
    def __init__(self, device: str, speed: int, rs485_control_pin=18):
        super().__init__()
        self.dev = serial.Serial(device, speed, timeout=0)
        self.rs485_control = OutputDevice(rs485_control_pin)
        self.rs485_control.off() # Strat default in receive mode

    def read(self, max_read: int):
        self.rs485_control.off() #Receive mode
        return self.dev.read(max_read)

    def write(self, data: bytes):
        self.rs485_control.on() #Transmit mode
        return self.dev.write(data)

    def flush(self):
        self.dev.flush()

    def __del__(self):
        if self.dev.is_open:
            self.dev.close()

parser = argparse.ArgumentParser(prog='cp_app', description="LibOSDP CP APP Example")
parser.add_argument("device", nargs='?', default="/dev/ttyAMA0", type=str, help="Path to serial device (default: /dev/ttyAMA0)")
parser.add_argument("--baudrate", type=int, metavar="N", default=9600, help="Serial port's baud rate (default: 9600)")
parser.add_argument("--log-level", type=int, metavar="LEVEL", default=6, help="LibOSDP log level; can be 0-7 (default: 6)")
args = parser.parse_args()


## Describe the PD (setting scbk=None puts the PD in install mode)
channel = SerialChannel(args.device, args.baudrate)
pd_info = [
    PDInfo(0, channel, scbk=KeyStore.gen_key()),
]

## Create a CP device and kick-off the handler thread
cp = ControlPanel(pd_info, log_level=args.log_level)
cp.start()
cp.sc_wait_all()

## create a LED Command to be used later
led_cmd = {
    'command': Command.LED,
    'reader': 0,
    'led_number': 0,
    'control_code': 1,
    'on_count': 10,
    'off_count': 10,
    'on_color': CommandLEDColor.Red,
    'off_color': CommandLEDColor.Black,
    'timer_count': 10,
    'temporary': True
}

count = 0  # loop counter
while True:
    ## Send LED command to PD-0
    cp.send_command(pd_info[0].address, led_cmd)

    ## Check if we have an event from PD
    event = cp.get_event(pd_info[0].address, timeout=2)
    if event:
        print(f"PD-0 Sent Event {event}")

    if count >= 5:
        break
    count += 1

    time.sleep(0.05)

cp.teardown()

On PD side (ATtiny3224):
OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: CAP(62) REPLY: PDCAP(46)

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0xa258/0xfe58

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0x289e/0xfc9e

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0xe73b/0xff3b

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0xa258/0xfa58

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0x289e/0xf89e

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0xe73b/0xff3b

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0xa258/0xfa58

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0x289e/0xf89e

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

OSDP: PD-0: osdp_phy.c:415 [ERROR] Invalid crc 0x887e/0xf87e

OSDP: PD-0: osdp_pd.c:1031 [ERROR] CMD receive error/timeout - err:-2

code:

#include<Arduino.h>
#include <osdp.hpp>

#define BAUD_RATE 9600

#define RS485_TRANSMIT HIGH
#define RS485_RECEIVE LOW
#define RS485_DIRECTION_PIN 3 

#define GREEN_LED_PIN 6
#define GREEN_LED_NUM 0
#define RED_LED_PIN 7
#define RED_LED_NUM 1

#define BUZZER_PIN 0
#define BUZZER_FREQUENCY 1000 // Hz

static unsigned long previousMillis = 0;  
const unsigned long interval_2000 = 2000;      
const unsigned long interval_50 = 50;

OSDP::PeripheralDevice pd;


int sample_pd_send_func(void *data, uint8_t *buf, int len) {
    (void)(data);

    // Set RS485 module to Transmit mode
    digitalWrite(RS485_DIRECTION_PIN, RS485_TRANSMIT);
    //delayMicroseconds(100);

    Serial0.write(buf, len);

    // Ensure all data is sent before switching back to Receive mode
    Serial0.flush();
    //delayMicroseconds(100);
    digitalWrite(RS485_DIRECTION_PIN, RS485_RECEIVE);
   
    return len;
}

int sample_pd_recv_func(void *data, uint8_t *buf, int len)
{
  (void)(data);

    int bytesRead = 0;
    digitalWrite(RS485_DIRECTION_PIN, RS485_RECEIVE);
    //delayMicroseconds(100);

    while (Serial0.available() > 0 && bytesRead < len) {
        buf[bytesRead++] = Serial0.read();
    }

    return bytesRead;
}

int pd_command_handler(void *data, struct osdp_cmd *cmd)
{
  (void)(data);
  
  Serial1.print ("CALLBACK: PD: CMD ");
  Serial1.println (cmd->id);
  Serial1.flush();

  switch (cmd->id){
    case OSDP_CMD_MFG:
      Serial1.println ("MFG");
      return -9; 
      break;
    case OSDP_CMD_KEYSET:
      if (cmd->keyset.type == 1){
        // store cmd->data;
      }
      break;
    case OSDP_CMD_OUTPUT:
      //cmd->output.output_no, // 0 = first output
      //cmd->output.control_code, // 1 = Off. 2 = On. See osdp.h for other values. e.g. Timed Values
      return 0;
      break;

    case OSDP_CMD_LED:
      Serial1.print("LED command received: ");
      Serial1.println(cmd->id);

    if (cmd->led.led_number == GREEN_LED_NUM) {
      if (cmd->led.temporary.control_code == 2) { // Temporary activation
        digitalWrite(GREEN_LED_PIN, HIGH);
        Serial1.println("GREEN LED turned ON");

        // Calculate duration in milliseconds from deciseconds
        unsigned long duration_ms = cmd->led.temporary.on_count * 100;

        delay(duration_ms);
        digitalWrite(GREEN_LED_PIN, LOW);
        Serial1.println("GREEN LED OFF");
      }
    }
    else if (cmd->led.led_number == RED_LED_NUM) {
      if (cmd->led.temporary.control_code == 2) { // Temporary activation
        digitalWrite(RED_LED_PIN, HIGH);
        Serial1.println("RED LED turned ON");

        // Calculate duration in milliseconds from deciseconds
        unsigned long duration_ms = cmd->led.temporary.on_count * 100;

        delay(duration_ms);
        digitalWrite(RED_LED_PIN, LOW);
        Serial1.println("RED LED turned OFF");
      }
    }
    return 0;
    break;
    
    case OSDP_CMD_SENTINEL:
      /*...*/
      return 0;
      break;
    
    case OSDP_CMD_BUZZER:
      Serial1.print("BUZZ command received: ");
      Serial1.println(cmd->id);

      // Handle passive BUZZER control command
      Serial1.println("BUZZER turned ON");
      tone(BUZZER_PIN, BUZZER_FREQUENCY, cmd->buzzer.on_count * 100);
      Serial1.println("BUZZER OFF");

      return 0;
      break;
  }

  return 0;
}

osdp_pd_info_t info_pd = {
  .name = "PD",
  .baud_rate = BAUD_RATE,
  .address = 0, // Must be 0 if only one PD is connected
  .flags = 0, 
  .id = {
    .version = 1,
    .model = 153,
    .vendor_code = 31337,
    .serial_number = 1111,
    .firmware_version = 2222,
  },
  .cap = (struct osdp_pd_cap []) {
    {
      .function_code = OSDP_PD_CAP_READER_LED_CONTROL,
      .compliance_level = 2, // 1 basic control, 2 full control
      .num_items = 2 // Number of LEDs in PD device
    },
    {
      .function_code = OSDP_PD_CAP_CARD_DATA_FORMAT,
      .compliance_level = 2,
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_READER_AUDIBLE_OUTPUT,
      .compliance_level = 2,
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_OUTPUT_CONTROL,
      .compliance_level = 1,
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_READERS,
      .compliance_level = 2,
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_READER_TEXT_OUTPUT,
      .compliance_level = 2,
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_COMMUNICATION_SECURITY,
      .compliance_level = 1,
      // more doc/libosdp/secure-channel.rst
      .num_items = 0
    },
    {
      .function_code = OSDP_PD_CAP_CHECK_CHARACTER_SUPPORT,
      .compliance_level = 2, 
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_CONTACT_STATUS_MONITORING,
      .compliance_level = 1,
      .num_items = 1
    },
    {
      .function_code = OSDP_PD_CAP_RECEIVE_BUFFERSIZE,
      .compliance_level = 2,
      .num_items = 1
    },
    { static_cast<uint8_t>(-1), 0, 0 }
  },
  .channel = {
    .data = nullptr,
    .id = 0,
    .recv = sample_pd_recv_func,
    .send = sample_pd_send_func,
    .flush = nullptr 
  },
  .scbk = nullptr,
};

/*
The event queue depth is only 4 after 4th call it gives ERROR: slab allocation failed.
So for testing you have to use "pd.flush_events();" method in main() loop to push events!!
*/
void send_button_event(OSDP::PeripheralDevice &pd, uint8_t keycode) 
{
    Serial1.println("Button Pressed");

    osdp_event event;
    osdp_event *p_event = &event;
    
    p_event->type = OSDP_EVENT_KEYPRESS;
    p_event->keypress.reader_no = 0; // 0 - This device
    p_event->keypress.length = 1;   // Single key press
    //*(p_event->keypress.data + 0) = keycode; // Keycode of the pressed button
    p_event->keypress.data[OSDP_EVENT_KEYPRESS_MAX_DATALEN] = keycode;

    if (pd.notify_event(p_event) == 0) {
        Serial1.println("Button event sent successfully.");
    } else {
        Serial1.println("Failed to notify button event.");
    }
}
/*
void send_card_data(OSDP::PeripheralDevice &pd) 
{
    // Simulate card data
    uint8_t card_data[] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06};

    osdp_event event;
    osdp_event *p_event = &event;
    memset(p_event, 0, sizeof(event)); // Clear the data structure

    p_event->type = OSDP_EVENT_CARDREAD;
    p_event->cardread.reader_no = 0; // 0 - This device
    p_event->cardread.format = OSDP_CARD_FMT_ASCII; // Ensure this is valid
    p_event->cardread.length = 0; // Set the actual data length
    p_event->cardread.direction = false; // Direction where card read happened
    memcpy(p_event->cardread.data, card_data, p_event->cardread.length);
    
    // Debugging: Print the card data
    Serial1.print("Card data: ");
    for (int i = 0; i < p_event->cardread.length; i++) {
        Serial1.print(p_event->cardread.data[i], HEX);
        Serial1.print(" ");
    }
    Serial1.println();
        
    // Notify the event
    if (pd.notify_event(p_event) == 0) {
        Serial1.println("Card event sent successfully.");
    } else {
        Serial1.print("Failed to notify event.");
    }
}
*/
int print_log_msg(const char *msg)
{
  if (msg == nullptr) return 0;

  unsigned length = strlen(msg);
  Serial1.println(msg);
  
  return length;
}


void setup() 
{
  Serial1.begin (BAUD_RATE); // TX pin is for USB-C debus msg, RX is for read RFID ID-12LA data
  Serial0.begin (BAUD_RATE); // For RS485 comunnication
  
  pinMode(GREEN_LED_PIN, OUTPUT);
  pinMode(RED_LED_PIN, OUTPUT);

  pinMode(BUZZER_PIN, OUTPUT);
  
  pinMode (RS485_DIRECTION_PIN, OUTPUT);
  digitalWrite (RS485_DIRECTION_PIN, RS485_RECEIVE);
  
  
  pd.logger_init("osdp::pd", OSDP_LOG_DEBUG, print_log_msg); // Call before setup()
  pd.setup(&info_pd);
  pd.set_command_callback(pd_command_handler, nullptr);

  delay(200);

  Serial1.println("OSDP Control Panel initialized.");
}

void loop() 
{
  static unsigned long previousDelayMillis = 0;  
  unsigned long currentMillis = millis();
    /*
    if (currentMillis - previousMillis >= 5000) {
        previousMillis = currentMillis;
        send_button_event(pd, 0x30);
        pd.flush_events();
    }
    */
    if (currentMillis - previousDelayMillis >= interval_50) {
        previousDelayMillis = currentMillis;
        pd.refresh();
    }
}

[MarosMotaj]

After I edited write() method in CP I have this response from PD:
OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

OSDP: PD-0: osdp_pd.c:667 [DEBUG] CMD: ID(61) REPLY: PDID(45)

from CP side not works yet:
pyosdp: 2025-04-06T13:42:33Z osdp_cp.c:1461 [INFO ] CP Setup complete; LibOSDP-3.0.8 master (8c334ad) NumPDs:1 Channels:1
OSDP: CP: PD-0: 2025-04-06T13:42:34Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (1)
OSDP: CP: PD-0: 2025-04-06T13:42:35Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (2)
OSDP: CP: PD-0: 2025-04-06T13:42:36Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (3)
OSDP: CP: PD-0: 2025-04-06T13:42:37Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (4)
OSDP: CP: PD-0: 2025-04-06T13:42:39Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (5)
OSDP: CP: PD-0: 2025-04-06T13:42:40Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (6)
OSDP: CP: PD-0: 2025-04-06T13:42:41Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (7)
OSDP: CP: PD-0: 2025-04-06T13:42:42Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (8)
OSDP: CP: PD-0: 2025-04-06T13:42:44Z osdp_cp.c:901 [ERROR] Response timeout for CMD: ID(61)
OSDP: CP: PD-0: 2025-04-06T13:42:44Z osdp_cp.c:1210 [ERROR] Going offline for 300 seconds; Was in 'ID-Request' state

[MarosMotaj]

I use logic analyzer for debug and I find that CP send msg to PD and PD response to CP but the response is not delivered to CP. Problem is on MAX485 CPs module. I think the switching between transmitt and receive mode on CP side is not good set. I will check it.

[MarosMotaj]

After some play with delays the communication starts working but not very smooth. I can now send command to PD and event to CP.
pyosdp: 2025-04-19T16:14:36Z osdp_cp.c:1461 [INFO ] CP Setup complete; LibOSDP-3.0.8 master (8c334ad) NumPDs:1 Channels:1
OSDP: CP: PD-0: 2025-04-19T16:14:37Z osdp_cp.c:680 [DEBUG] CMD: ID(61) REPLY: PDID(45)
OSDP: CP: PD-0: 2025-04-19T16:14:37Z osdp_cp.c:1220 [DEBUG] StateChange: [ID-Request] -> [Cap-Detect] (SC-Inactive)
OSDP: CP: PD-0: 2025-04-19T16:14:38Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (1)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_phy.c:521 [DEBUG] Packet scan skipped:29 mark:1
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'OutputControl' (1/1)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'CardDataFormat' (2/1)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'LEDControl' (2/2)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'AudibleControl' (2/1)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'CheckCharacter' (1/0)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'CommunicationSecurity' (1/0)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'ReceiveBufferSize' (0/1)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:456 [DEBUG] Reports capability 'Reader' (2/1)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:680 [DEBUG] CMD: CAP(62) REPLY: PDCAP(46)
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:1202 [INFO ] Online; Without SC
OSDP: CP: PD-0: 2025-04-19T16:14:40Z osdp_cp.c:1220 [DEBUG] StateChange: [Cap-Detect] -> [Online] (SC-Inactive)
OSDP: CP: PD-0: 2025-04-19T16:14:41Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (2)
OSDP: CP: PD-0: 2025-04-19T16:14:43Z osdp_phy.c:521 [DEBUG] Packet scan skipped:2 mark:1
OSDP: CP: PD-0: 2025-04-19T16:14:44Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (3)
OSDP: CP: PD-0: 2025-04-19T16:14:46Z osdp_phy.c:521 [DEBUG] Packet scan skipped:2 mark:1
PD-0 Sent Event {'event': 2, 'reader_no': 0, 'data': b'b'}
PD-0 Sent Event {'event': 2, 'reader_no': 0, 'data': b'b'}
OSDP: CP: PD-0: 2025-04-19T16:14:47Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (4)
OSDP: CP: PD-0: 2025-04-19T16:14:50Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (5)
OSDP: CP: PD-0: 2025-04-19T16:14:51Z osdp_phy.c:489 [ERROR] Packet sequence mismatch (1/3)
OSDP: CP: PD-0: 2025-04-19T16:14:51Z osdp_cp.c:1210 [ERROR] Going offline for 300 seconds; Was in 'Online' state
OSDP: CP: PD-0: 2025-04-19T16:14:51Z osdp_cp.c:1220 [DEBUG] StateChange: [Online] -> [Offline] (SC-Inactive)

But I have this ERROR log msgs:

OSDP: CP: PD-0: 2025-04-19T16:00:27Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (1)
.
.
.
OSDP: CP: PD-0: 2025-04-19T16:00:33Z osdp_cp.c:897 [WARN ] No response in 200ms; probing (7)
OSDP: CP: PD-0: 2025-04-19T16:00:42Z osdp_phy.c:489 [ERROR] Packet sequence mismatch (3/2)
OSDP: CP: PD-0: 2025-04-19T16:00:42Z osdp_cp.c:1210 [ERROR] Going offline for 300 seconds; Was in 'Online' state
OSDP: CP: PD-0: 2025-04-19T16:00:42Z osdp_cp.c:1220 [DEBUG] StateChange: [Online] -> [Offline] (SC-Inactive)

I have to synchronise delays ?

Thanks :)