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ESP32 Packet Format & DataNet Protocol - Revision history
2026-04-18T14:05:32Z
Revision history for this page on the wiki
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http://groupkos.com/dev/index.php?title=ESP32_Packet_Format_%26_DataNet_Protocol&diff=5240&oldid=prev
XenoEngineer at 16:10, 28 June 2025
2025-06-28T16:10:03Z
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XenoEngineer
http://groupkos.com/dev/index.php?title=ESP32_Packet_Format_%26_DataNet_Protocol&diff=5234&oldid=prev
XenoEngineer at 15:55, 28 June 2025
2025-06-28T15:55:34Z
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XenoEngineer
http://groupkos.com/dev/index.php?title=ESP32_Packet_Format_%26_DataNet_Protocol&diff=5232&oldid=prev
XenoEngineer: Created page with "Category:dataNet <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>ESP32 Packet Format & Protocol Details</title> <style> body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; margin: 0; padding: 20px; background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%); min-height: 100vh;..."
2025-06-28T15:51:26Z
<p>Created page with "<a href="/dev/index.php/Category:DataNet" title="Category:DataNet">Category:dataNet</a> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>ESP32 Packet Format & Protocol Details</title> <style> body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; margin: 0; padding: 20px; background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%); min-height: 100vh;..."</p>
<p><b>New page</b></p><div>[[Category:dataNet]]<br />
<br />
<html lang="en"><br />
<head><br />
<meta charset="UTF-8"><br />
<meta name="viewport" content="width=device-width, initial-scale=1.0"><br />
<title>ESP32 Packet Format & Protocol Details</title><br />
<style><br />
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font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;<br />
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background: linear-gradient(145deg, #667eea, #764ba2);<br />
color: white;<br />
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text-align: center;<br />
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transition: transform 0.3s ease;<br />
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.packet-field:hover {<br />
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.field-name {<br />
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.field-size {<br />
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color: #fff;<br />
}<br />
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.field-description {<br />
font-size: 0.8em;<br />
margin-top: 5px;<br />
opacity: 0.9;<br />
}<br />
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.protocol-section {<br />
background: white;<br />
border-radius: 15px;<br />
padding: 25px;<br />
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box-shadow: 0 5px 15px rgba(0,0,0,0.1);<br />
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.highlight {<br />
background: rgba(52, 152, 219, 0.3);<br />
padding: 2px 4px;<br />
border-radius: 3px;<br />
}<br />
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.timing-diagram {<br />
background: #e8f5e8;<br />
border-radius: 15px;<br />
padding: 25px;<br />
margin: 25px 0;<br />
text-align: center;<br />
}<br />
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.timing-sequence {<br />
display: flex;<br />
justify-content: space-around;<br />
align-items: center;<br />
flex-wrap: wrap;<br />
gap: 15px;<br />
margin: 20px 0;<br />
}<br />
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.timing-step {<br />
background: white;<br />
padding: 15px;<br />
border-radius: 10px;<br />
box-shadow: 0 3px 10px rgba(0,0,0,0.1);<br />
min-width: 100px;<br />
font-size: 0.9em;<br />
text-align: center;<br />
}<br />
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.timing-arrow {<br />
font-size: 1.5em;<br />
color: #27ae60;<br />
}<br />
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.register-map {<br />
display: grid;<br />
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));<br />
gap: 20px;<br />
margin: 20px 0;<br />
}<br />
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border-left: 4px solid #e74c3c;<br />
}<br />
<br />
.register-addr {<br />
font-weight: bold;<br />
color: #e74c3c;<br />
font-size: 1.1em;<br />
}<br />
<br />
.register-desc {<br />
color: #555;<br />
margin-top: 8px;<br />
line-height: 1.4;<br />
}<br />
<br />
.data-format {<br />
background: #fff3cd;<br />
border: 1px solid #ffeaa7;<br />
border-radius: 10px;<br />
padding: 20px;<br />
margin: 20px 0;<br />
}<br />
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.format-table {<br />
width: 100%;<br />
border-collapse: collapse;<br />
margin-top: 15px;<br />
}<br />
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.format-table th, .format-table td {<br />
border: 1px solid #ddd;<br />
padding: 12px;<br />
text-align: left;<br />
}<br />
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.format-table th {<br />
background: #f8f9fa;<br />
font-weight: bold;<br />
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.format-table tr:nth-child(even) {<br />
background: #f8f9fa;<br />
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@media (max-width: 768px) {<br />
.timing-sequence {<br />
flex-direction: column;<br />
}<br />
.timing-arrow {<br />
transform: rotate(90deg);<br />
}<br />
.packet-structure {<br />
grid-template-columns: 1fr;<br />
}<br />
}<br />
</style><br />
</head><br />
<body><br />
<div class="container"><br />
<h1>📡 ESP32 Packet Format & Protocol Details</h1><br />
<br />
<div class="packet-visual"><br />
<div class="packet-title">🔗 Event Data Packet Structure</div><br />
<div class="packet-structure"><br />
<div class="packet-field"><br />
<div class="field-name">HEADER</div><br />
<div class="field-size">2 bytes</div><br />
<div class="field-description">Magic: 0xABCD</div><br />
</div><br />
<div class="packet-field"><br />
<div class="field-name">PACKET_ID</div><br />
<div class="field-size">2 bytes</div><br />
<div class="field-description">Sequence number</div><br />
</div><br />
<div class="packet-field"><br />
<div class="field-name">ON_TIMESTAMP</div><br />
<div class="field-size">4 bytes</div><br />
<div class="field-description">Microseconds</div><br />
</div><br />
<div class="packet-field"><br />
<div class="field-name">OFF_TIMESTAMP</div><br />
<div class="field-size">4 bytes</div><br />
<div class="field-description">Microseconds</div><br />
</div><br />
<div class="packet-field"><br />
<div class="field-name">EVENT_COUNT</div><br />
<div class="field-size">4 bytes</div><br />
<div class="field-description">Binary counter</div><br />
</div><br />
<div class="packet-field"><br />
<div class="field-name">CHECKSUM</div><br />
<div class="field-size">2 bytes</div><br />
<div class="field-description">CRC16</div><br />
</div><br />
</div><br />
<p style="text-align: center; color: #7f8c8d; margin-top: 20px;"><br />
<strong>Total packet size: 18 bytes</strong> | Block size: 10-100 packets (180-1800 bytes)<br />
</p><br />
</div><br />
<br />
<div class="protocol-section"><br />
<h3>🚀 ESP32 Firmware Event Capture</h3><br />
<div class="code-block" data-lang="C++"><br />
// ESP32 Interrupt Handler for Binary Input<br />
volatile uint32_t on_timestamp = 0;<br />
volatile bool waiting_for_off = false;<br />
EventPacket event_buffer[BLOCK_SIZE];<br />
volatile int buffer_index = 0;<br />
<br />
void IRAM_ATTR binary_input_isr() {<br />
uint32_t current_time = esp_timer_get_time(); // microseconds<br />
<br />
if (digitalRead(BINARY_INPUT_PIN) == HIGH) {<br />
// Rising edge - store ON timestamp<br />
on_timestamp = current_time;<br />
waiting_for_off = true;<br />
} <br />
else if (waiting_for_off) {<br />
// Falling edge - capture complete event<br />
EventPacket* packet = &event_buffer[buffer_index];<br />
<br />
packet->header = 0xABCD;<br />
packet->packet_id = ++sequence_counter;<br />
packet->on_timestamp = on_timestamp;<br />
packet->off_timestamp = current_time;<br />
packet->event_count = read_binary_counter(); // Sample counter NOW<br />
packet->checksum = calculate_crc16(packet);<br />
<br />
buffer_index++;<br />
waiting_for_off = false;<br />
<br />
// Check if block is full<br />
if (buffer_index >= BLOCK_SIZE) {<br />
xQueueSendFromISR(transmit_queue, &event_buffer, NULL);<br />
buffer_index = 0; // Reset for next block<br />
}<br />
}<br />
}<br />
</div><br />
</div><br />
<br />
<div class="timing-diagram"><br />
<div class="packet-title">⏱️ Event Capture Timing Sequence</div><br />
<div class="timing-sequence"><br />
<div class="timing-step">Binary Input<br>HIGH</div><br />
<div class="timing-arrow">→</div><br />
<div class="timing-step">Store<br>ON timestamp</div><br />
<div class="timing-arrow">→</div><br />
<div class="timing-step">Binary Input<br>LOW</div><br />
<div class="timing-arrow">→</div><br />
<div class="timing-step">Capture<br>OFF timestamp</div><br />
<div class="timing-arrow">→</div><br />
<div class="timing-step">Sample<br>Counter</div><br />
<div class="timing-arrow">→</div><br />
<div class="timing-step">Store<br>Event Packet</div><br />
<div class="timing-arrow">→</div><br />
<div class="timing-step">Block Full?<br>Transmit</div><br />
</div><br />
</div><br />
<br />
<div class="protocol-section"><br />
<h3>📤 Block Transmission Protocol (UDP)</h3><br />
<div class="data-format"><br />
<strong>Block Header Format:</strong><br />
<table class="format-table"><br />
<tr><th>Field</th><th>Size</th><th>Description</th><th>Example</th></tr><br />
<tr><td>Block Magic</td><td>4 bytes</td><td>0xDEADBEEF</td><td>Block identifier</td></tr><br />
<tr><td>Block ID</td><td>4 bytes</td><td>Sequential</td><td>0x00000001</td></tr><br />
<tr><td>Packet Count</td><td>2 bytes</td><td>Events in block</td><td>50</td></tr><br />
<tr><td>Timestamp Base</td><td>4 bytes</td><td>Block start time</td><td>System uptime</td></tr><br />
<tr><td>Event Packets</td><td>N * 18 bytes</td><td>Event data array</td><td>Variable</td></tr><br />
<tr><td>Block CRC</td><td>4 bytes</td><td>Integrity check</td><td>CRC32</td></tr><br />
</table><br />
</div><br />
</div><br />
<br />
<div class="protocol-section"><br />
<h3>⚙️ Control Register Map</h3><br />
<div class="register-map"><br />
<div class="register-item"><br />
<div class="register-addr">0x1000 - CONTROL_MODE</div><br />
<div class="register-desc"><br />
Bit 0: Enable event capture<br><br />
Bit 1: Reset counter<br><br />
Bit 2: Trigger calibration<br />
</div><br />
</div><br />
<div class="register-item"><br />
<div class="register-addr">0x1004 - BLOCK_SIZE</div><br />
<div class="register-desc"><br />
Number of events per transmission block (10-100)<br><br />
Default: 25 events<br />
</div><br />
</div><br />
<div class="register-item"><br />
<div class="register-addr">0x1008 - THRESHOLD_VALUE</div><br />
<div class="register-desc"><br />
Digital input threshold voltage (mV)<br><br />
For add-on board signal conditioning<br />
</div><br />
</div><br />
<div class="register-item"><br />
<div class="register-addr">0x100C - COUNTER_PRESCALER</div><br />
<div class="register-desc"><br />
Binary counter clock divider<br><br />
Controls counting resolution<br />
</div><br />
</div><br />
<div class="register-item"><br />
<div class="register-addr">0x1010 - STATUS_FLAGS</div><br />
<div class="register-desc"><br />
Bit 0: Buffer overflow<br><br />
Bit 1: WiFi connected<br><br />
Bit 2: Counter running<br />
</div><br />
</div><br />
<div class="register-item"><br />
<div class="register-addr">0x1014 - DEBUG_OUTPUT</div><br />
<div class="register-desc"><br />
Test signal generation<br><br />
For add-on board verification<br />
</div><br />
</div><br />
</div><br />
</div><br />
<br />
<div class="protocol-section"><br />
<h3>🔄 PC ↔ ESP32 Communication Protocol</h3><br />
<div class="code-block" data-lang="Python"><br />
# Python Device Communication Service<br />
import socket<br />
import struct<br />
import asyncio<br />
<br />
class ESP32Protocol:<br />
def __init__(self, esp32_ip, port=8888):<br />
self.esp32_ip = esp32_ip<br />
self.port = port<br />
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)<br />
<br />
def write_register(self, address, value):<br />
# Command format: [CMD][ADDR][VALUE]<br />
packet = struct.pack('<BII', 0x01, address, value) # WRITE_CMD<br />
self.sock.sendto(packet, (self.esp32_ip, self.port))<br />
<br />
def read_register(self, address):<br />
# Command format: [CMD][ADDR]<br />
packet = struct.pack('<BI', 0x02, address) # READ_CMD<br />
self.sock.sendto(packet, (self.esp32_ip, self.port))<br />
response, addr = self.sock.recvfrom(8)<br />
return struct.unpack('<I', response[4:])[0] # Skip status bytes<br />
<br />
async def listen_for_events(self, callback):<br />
# Listen for event data blocks<br />
while True:<br />
data, addr = self.sock.recvfrom(2048) # Max block size<br />
if len(data) >= 18: # Minimum block header<br />
block = self.parse_event_block(data)<br />
await callback(block)<br />
<br />
def parse_event_block(self, data):<br />
# Parse block header<br />
magic, block_id, count, timestamp_base = struct.unpack('<IIHH', data[:12])<br />
<br />
events = []<br />
offset = 16 # Skip block header<br />
<br />
for i in range(count):<br />
if offset + 18 <= len(data):<br />
# Parse event packet<br />
header, pkt_id, on_time, off_time, counter, crc = \<br />
struct.unpack('<HHIIII', data[offset:offset+18])<br />
<br />
events.append({<br />
'packet_id': pkt_id,<br />
'on_timestamp': on_time,<br />
'off_timestamp': off_time,<br />
'pulse_width': off_time - on_time, # Calculate immediately<br />
'event_count': counter,<br />
'block_id': block_id<br />
})<br />
offset += 18<br />
<br />
return {'block_id': block_id, 'events': events, 'timestamp_base': timestamp_base}<br />
</div><br />
</div><br />
<br />
<div class="protocol-section"><br />
<h3>📊 Analysis Service Data Processing</h3><br />
<div class="code-block" data-lang="Python"><br />
# Event Data Service - Pulse Analysis<br />
import numpy as np<br />
from collections import deque<br />
<br />
class PulseAnalyzer:<br />
def __init__(self, window_size=1000):<br />
self.pulse_widths = deque(maxlen=window_size)<br />
self.frequencies = deque(maxlen=window_size)<br />
self.counter_deltas = deque(maxlen=window_size)<br />
self.last_counter = 0<br />
<br />
def process_event_block(self, block):<br />
events = block['events']<br />
<br />
for event in events:<br />
# Calculate pulse characteristics<br />
pulse_width = event['pulse_width'] # microseconds<br />
counter_delta = event['event_count'] - self.last_counter<br />
<br />
self.pulse_widths.append(pulse_width)<br />
self.counter_deltas.append(counter_delta)<br />
self.last_counter = event['event_count']<br />
<br />
# Calculate frequency from recent events<br />
if len(events) > 1:<br />
time_span = events[-1]['off_timestamp'] - events[0]['on_timestamp']<br />
frequency = (len(events) - 1) * 1e6 / time_span # Hz<br />
self.frequencies.append(frequency)<br />
<br />
# Return analysis results for UI feedback<br />
return {<br />
'avg_pulse_width': np.mean(self.pulse_widths) if self.pulse_widths else 0,<br />
'frequency': np.mean(self.frequencies) if self.frequencies else 0,<br />
'counter_rate': np.mean(self.counter_deltas) if self.counter_deltas else 0,<br />
'pulse_jitter': np.std(self.pulse_widths) if len(self.pulse_widths) > 1 else 0<br />
}<br />
</div><br />
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