I've used the mDot's without issues on The Things Network, if that's what you're looking for; I think the frequency is properly set for your region, so you don't have to issue those commands. You can review them with AT&V
For ABP you need to set:
AT+PN=1
AT+NA=(your dev_addr from your range registered on the wiki)
AT+NSK=2B7E151628AED2A6ABF7158809CF4F3C
AT+DSK=2B7E151628AED2A6ABF7158809CF4F3C
AT+NJM=0
You can indeed save this via AT&W but either way a
AT+JOIN
joins the network with previously made settings.
To fix your device on SF7:
AT+TXDR=7
And to send data:
AT+SEND=Blablabla
or
AT+SENDB=aabbcc
to send hex data.
The mDot also works well with OTAA, and with ACKs, but these are not yet implemented in the current TTN backend.
I was unable to find the right syntax for adding frequencies via AT+TXCH (in 867), so if anyone has those I'm interested. But I think we can maybe set these from the network-server in an OTAA join later.
I've used the mDot in the Bee socket on an Sodaq Mbili, the Autonomo had headers in the way, physically. Also the development board works well of course 
using the serial interface.