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PelionIoT / mbed-coap

CoAP C library - Builder and Parser for CoAP messages
Apache License 2.0
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Ack packet don't return #77

Closed zesoxi closed 5 years ago

zesoxi commented 5 years ago

Hi, I'm trying to write a coap server over stm32 with mbed os. I'm want to use coap to send and receive big data from the PC to the MCU with the blockwise feature. When my python script(CoAPhon) sending a PUT request, I'm passing the packet to the function sn_coap_protocol_parse. The function do no't return ACK even when the payload is really short and all the payload arrived in one packet. When I'm sending long packet, the function returns a ACK for every packet arrived except the last one. The problem is that the script is waiting for the ack. I tried to debug the library but didn't understood if i'm using the library wrong or that I don't understand the protocol. I'm enabled the blockwise feature and limited the payload size to 128 bytes, in the python script as well. I would like to hear a suggestion.

Thank you.

ciarmcom commented 5 years ago

ARM Internal Ref: IOTCLT-3207

anttiylitokola commented 5 years ago

Hi! Thanks for your report. Could you repeat your use case with the logs, maybe those would reveal something?

yogpan01 commented 5 years ago

Hi, CoAP library does ACK for the block packets. CoAP is using mbed-trace library for tracing, if you want to know how to use it , you can check this usage here https://github.com/ARMmbed/mbed-trace/tree/master/example/mbed-os-5.

Please let us know if your issue is resolved. We are closing the issue for now, but you can open it again once you have new information or issue still persist for you.