problem using recv with responses over 2k using https

[Ian Johnson]

I have an https connection (sending json) that works fine when the response is less 2k. But for responses (from the server) that are over 2048 bytes, recv returns 0 bytes. :(

nrf9160

1.5.1 SDK

https/TLS

[Øyvind]

Hello, 

The modem has a known TLS limitation of 2kB secure socket buffer size, documented in the modem FW release notes:

*** Limitations
***************
- TLS/DTLS
    - Up to three simultaneous TLS/DTLS connections are possible. It is recommended to free the
      modem resources by closing unused network sockets.
    - Maximum server certificate chain size has a limit of 4kB.
    - Server certificate expiry time is not verified.
    - pkcs#8 is not supported.
    - Absolute maximum number of supported credentials is 32. The actual amount depends on size of
      credentials as memory area reserved for credentials may be a limiting factor as well.
    - DTLS supports PSK authentication only.
    - 2kB secure socket buffer size.

Kind regards,
Øyvind

[Ian Johnson]

Thank you for the quick response!