TinyDTLS library as PSK encrypt layer doesn't work with 32 byte keys.

[thetoster]

I've builded client on ci40 / linux with enabled tinyDTLS as a security layer. Then I tried to run awa_clientd with PSK identity/key generated on Device Server platform. But as a result I'm getting errors about wrong key sizes. Here is log from console:

[INFO] Awa LWM2M Client, version 0.2.4
[INFO] Process ID : 22396
[INFO] Endpoint name : 'Awa Client'
[INFO] DTLS library : TinyDTLS
[INFO] CoAP library : Erbium
[INFO] CoAP port : 6000
[INFO] IPC port : 12345
[INFO] Address family : IPv4
[INFO] Bind port: 6000
[INFO] Try existing server entries
[INFO] No servers are defined
[INFO] Hold Off expired - attempt client-initiated bootstrap
[INFO] Bootstrap with coaps://ds-mono.flowcloud.systems:15684/bs?ep=Awa Client
[INFO] Coap request: coaps://ds-mono.flowcloud.systems:15684/bs?ep=Awa Client
[WARN] cannot set psk -- buffer too small
Nov 17 14:43:59 CRIT no psk key for session available
Nov 17 14:43:59 WARN error in check_server_hellodone err: -592
Nov 17 14:43:59 WARN error while handling handshake packet

[boyvinall]

Is this now resolved by #320 ?