#Define BUF MAX SIZE 250

[ebleme]

Hi. I am using this library to test CoAP performance for various situations. But I can't send CoAP packets if their payload length bigger than 250 characters.

Edit: Using this library on Client side.

I think the problem is on that lines

coap_client.h #define BUF_MAX_SIZE 250

coap_client.cpp inside the coapClient::sendPacket method

` // make payload if (packet.payloadlen > 0) {

    if ((packetsize + 1 + packet.payloadlen) >= buf_max_size) {
        return 0;
    }
    *p++ = 0xFF;
    memcpy(p, packet.payload, packet.payloadlen);
    packetSize += 1 + packet.payloadlen;
}

`

What can I do to make this library support more than 250 length of payload since -as much as I know- CoAP supports 1024 bytes of payload.

Thanks.

[abcosmi]

Hi @ebleme .

I made the following changes on the code to send 1000 bytes on the client side:

coap_client.h:

Set BUF_MAX_SIZE to 1024. Change the type of payloadlen attribute of coapPacket class from uint8_t to uint16_t;

//coap packet class class coapPacket { public: uint8_t type; uint8_t code; uint8_t token; uint8_t tokenlen; uint8_t payload; uint16_t payloadlen; <------ uint16_t messageid; uint8_t optionnum; coapOption options[MAX_OPTION_NUM]; };

In my case, I've needed to select another lwIP variant on Arduino IDE.

If you click on Tools and lwIP Variant, select v1.4 Higher Bandwidth option.

I've tested this using another ESP as coap server using the same configs.

I don't know if it's the right way, but it's my workaround.

[lovelesh]

@abcosmi. Thanks for bringing it to notice. If you like you can send a PR. i will merge into the master code

[ebleme]

@abcosmi Thank you very much. I made the changes and it solved the problem. I can now send bigger datas.