CoAP Packet Builder
Build CoAP (Constrained Application Protocol) packets. Create CoAP messages with headers, tokens, options, and payloads for IoT communication.
CoAP Header
Options
No options added. Click "Add Option" to add CoAP options.
Payload
CoAP Packet Structure
Header (4 bytes): Version (2 bits), Type (2 bits), Token Length (4 bits), Code (8 bits), Message ID (16 bits)
Token (0-8 bytes): Optional token for matching requests and responses
Options (variable): CoAP options like Uri-Path, Content-Format, etc. Options must be in ascending order by option number.
Payload Marker (0xFF): Present only if payload exists
Payload (variable): Message payload data
Note: Token length must match the actual token bytes. Options are automatically sorted by option number.