Packet Capture Analyzer

Inspect IoT packet captures with a guided Wireshark-style workflow

Packet Capture Analyzer

Animation Packet capture IoT protocols

Packet Capture Analyzer

Read a small IoT capture like a protocol analyst: filter the packet list, step through frames, inspect layers, connect bytes to fields, and explain the capture pattern.

MQTT publishselected capture

8 packetsvisible after filter

Frame 1selected packet

Normalcapture finding

What

A guided packet-capture workbench for MQTT, CoAP, and BLE traffic.

Why

Packet lists become readable when each row links to layers, fields, and bytes.

Try first

Step through MQTT, then isolate only publish traffic with a display filter.

Notice

Normal acknowledgements differ from retransmissions and radio notifications.

Capture

clean publish

Scenario trace MQTT publish session CoAP retransmission BLE GATT notifications

Display Filter

valid

Expression 8 / 8

Click a packet row or use Step Packet. The detail panel explains what the selected frame proves.

MQTT publish session

A sensor connects to a broker, publishes one value, and receives an acknowledgement.

Frame 1 selected

Packet list

No.	Time	Protocol	Flow	Info

Packet details

Conversation sequence

Protocol summary

Learning Support

Start with rows

Read number, time, protocol, endpoints, and info. That gives the first explanation of the conversation.

Filter next

Use a protocol or port filter before adding addresses. Broad filters reduce noise without hiding context too early.

Inspect layers

Layer details explain who owns each field. MQTT fields are application data; ports belong to transport.

Confirm with bytes

The hex view is simplified, but it keeps the habit of checking that parsed fields come from actual captured bytes.

Quick Reference

Protocol filter

mqtt

Shows only packets where the analyzer identified MQTT traffic.

Port filter

tcp.port==1883

Finds traffic using the standard unencrypted MQTT port.

Address filter

ip.addr==192.168.1.100

Shows packets where a device is either source or destination.

Message type

mqtt.type==PUBLISH

Moves from protocol-level filtering to one application message type.

Retransmission

coap.retransmission==true

Highlights repeated confirmable CoAP requests caused by missing acknowledgement.

Exclude noise

!ack

Hides acknowledgement-only packets so payload-carrying messages are easier to compare.

Packet Analysis LayersReview layers and display filters. Interactive Packet AnalyzerDecode packet bytes and compare protocol overhead. IoT Protocol ScenariosContinue with MQTT, CoAP, BLE, and Zigbee examples.