AT^SGAUTH format issue in Cinterion modules
I can see in the ELS61 AT reference that SGAUTH expects first user, then password:
AT^SGAUTH=<cid>, <auth_type>[, <user>, <passwd>]
While the PLS8-E AT reference for SGAUTH defines first password, then user:
AT^SGAUTH=<cid>[, <auth_type>[, <passwd>, <user>]]
ModemManager currently uses the latter.