LOGO!8 - S7 communication and protocol license

We think to extend usage of LOGO!8. To do this we need to access its S7 server from external device (not STIMATIC like) act as S7 client. Therefore we need to implenet S7 protocol. But S7 is modifyed version of Snap7.

So the question is: what kind of license required to use S7 protocol to communicate with LOGO!8? 

Other question is: There is any sample code which communicate with LOGO!8 S7 server using standard Sanp7 library?

This topic is partially linked to "LOGO and python-snap7 communication" topic.

Thanks for any advise.

LOGO use the same protocol as the S7-200 series.

In the HELP menu of LOGO-Soft Comfort you can see wich adresses are reserved for special functions (clock input/output marker et) and what adresses you can use for other values.

Look at Parameter VM mapping

Thank you.

But question is still open, it is permitted (by license) or not?

Snap7 say: "Siemens provides a lot of FB/FC (PLC side), Simatic NET software (PC side) and a huge excellent documentation about their use, but no internal protocol specifications. "

Our task is to develop some kind of low power consumption control cloud using maybe hundreds of PLC (e.g. LOGO!). Therefore  power-hungry standard PC based platform are not meet with our requirements. Our cloud need to communicate directly with PLC, so we need to develop own protocol library. We have experience with OSI transport protocols, but without exact specification we have no chance.

So, this already done by writing a new code based on libnodave methods. But how to:

1. start logo program using S7?
2. stop logo program using S7?
3. get system paramteres (fw, logo ver) using S7?
4. get diagram name or id using S7?
5. actual time using S7?

Libnodave does not povide usefull solution for this above. Looks like dave try to implement this functions, but he's have no success for CP-200 (=LOGO! 8).

Thanks for any advise.