Since I have some stability issues with the rpcWiFi library I tried out if I could get SSL-secured transmission with an httpClient and an Ethernet module working.
I used this Ethernet library:
-https://github.com/jandrassy/EthernetENC
and the SSLClient and httpClient from here:
-https://github.com/khoih-prog/EthernetWebServer_SSL
An example showing https Get requests, adapted for the Wio Terminal (PlatformIO), is here:
-https://github.com/RoSchmi/Wio_Terminal_Enc28_Ethernet_Https_Get
Transferring sensor data to Azure Storage Tables works as well:
-https://github.com/RoSchmi/AzureDataSender_Wio_Terminal_Eth