Hello @marmoun,
To clarify, the Mobile POST/GET functionality is still available on the RUT956 (7.13.4 FW), but it needs to be installed separately via the Package Manager, as mentioned in the topic here:
Furthermore, just to confirm, I’ve checked, and SMS sending via the API endpoint also works as expected:
Could you please let me know what response message you receive when attempting the request?
Best regards,