How to add DTLS to nRF coap client

[ced27]

Hello,

i ran  nRF Coap Client and it worked pretty well.

I am working with nRF9160 DK.

Now, I want to add DTLS to this example to secure the data.

Can someone please help me or is there any tutorials on how to do that?

Best regards,

Cedric

[ced27]

Albrecht Markus Schellenberger said:

The problem appears to be the destination, which is 0.0.0.0. Which server/IP address are you trying to connect to? What is CONFIG_SERVER_ADRESS defined as?

CONFIG_SERVER_ADRESS is "californium.eclipseprojects.io" and the IP address is 35.185.40.182

[Albrecht Markus Schellenberger]

ced27 said:

CONFIG_SERVER_ADRESS is "californium.eclipseprojects.io" and the IP address is 35.185.40.182

In your case, CONFIG_SERVER_ADDRESS has to be the IP address since you can’t use the actual address of the server as an input argument to inet_pton (right now probably the function won’t return 1).

But anyway, my recommendation would be to use getaddrinfo for CONFIG_SERVER_ADDRESS, as demonstrated in the CoAP Client sample.

Regards,

Markus

[ced27]

here is what i got:

Fullscreen 2021-10-25T08_20_24.407Z-log.txt Download

2021-10-25T08:20:25.195Z INFO Application data folder: C:\Users\tcheced\AppData\Roaming\nrfconnect\pc-nrfconnect-linkmonitor
2021-10-25T08:20:25.236Z DEBUG App pc-nrfconnect-linkmonitor v1.1.10 official
2021-10-25T08:20:25.236Z DEBUG App path: C:\Users\tcheced\.nrfconnect-apps\node_modules\pc-nrfconnect-linkmonitor
2021-10-25T08:20:25.236Z DEBUG nRFConnect 3.7.1, required by the app is (^3.6.0)
2021-10-25T08:20:25.236Z DEBUG nRFConnect path: C:\Users\tcheced\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-10-25T08:20:25.236Z DEBUG HomeDir: C:\Users\tcheced
2021-10-25T08:20:25.237Z DEBUG TmpDir: C:\Users\tcheced\AppData\Local\Temp
2021-10-25T08:20:25.248Z VERBOSE Could not fetch serial number for serial port at COM3
2021-10-25T08:20:27.603Z INFO Modem port is opened
2021-10-25T08:20:32.404Z DEBUG modem << *** Booting Zephyr OS build v2.6.0-rc1-ncs1  ***
2021-10-25T08:20:32.433Z DEBUG modem << Startet.....
2021-10-25T08:20:32.688Z DEBUG modem << PSM-Modus aktiviert
2021-10-25T08:20:32.693Z DEBUG modem << Verbindung zum LTE-Netz wird hergestellt
2021-10-25T08:20:32.696Z DEBUG modem << Das kann ein paar Minuten dauern..
2021-10-25T08:20:32.823Z DEBUG modem << Mit LTE-Netz verbunden
2021-10-25T08:20:33.994Z DEBUG modem << +CEREG: 2,"63AE","01A3F802",7
2021-10-25T08:20:34.020Z DEBUG modem << LTE veränderte Zelle: Zelle ID: 27523074, Tracking area: 25518
2021-10-25T08:20:34.031Z DEBUG modem << Active LTE Modus: LTE-M
2021-10-25T08:20:34.032Z DEBUG modem << +CSCON: 1
2021-10-25T08:20:34.035Z DEBUG modem << RRC Modus: verbunden
2021-10-25T08:20:36.847Z DEBUG modem << +CEREG: 5,"63AE","01A3F802",7,,,"00000000","11100000"
2021-10-25T08:20:36.856Z DEBUG modem << Netwerkregistrierungsstatus: verbunden mit Roaming
2021-10-25T08:20:36.864Z DEBUG modem << IPv4 Address found 35.185.40.182
2021-10-25T08:20:36.868Z DEBUG modem << PSM-Parameter update: TAU: -1, Active time: 0
2021-10-25T08:20:37.391Z DEBUG modem << Verbindung fehlgeschlagen: error 95
2021-10-25T08:20:37.396Z DEBUG modem << Keine Verbindung zum Server möglich

Any idea of what the problem may be?

[Albrecht Markus Schellenberger]

ced27 said:

Any idea of what the problem may be?

Have you updated the modem and server with a Pre-shared Key (PSK)?

[ced27]

Hi Markus,

i haven't done it from the Californium server side yet. Is there may be any tutorials on how i may it? And eventually how i may run a host on the californium server?

Any idea will help

thanks