If you want to test the connectivity between your devices, you can do it easily but first you need to have in mind few things:
1. Each endpoint has a static private IP address assigned.
2. Each IP assigned to an endpoint belongs to an IP address space. (normally each IP address space has 1022 IP address)
3. If you are working with a large number of devices (>1022 endpoints), you could have several IP address spaces.
4. You can add up to 5 IP address spaces via the EMnify User Interface (EUI)
Each IP address space works like a LAN network, that means that you can perform a connectivity test (PING) between your endpoints without using a VPN. Indeed, the endpoints are already inside the LAN.
NB: Be aware if you have more than 1022 devices, more that one IP address space will be required. Two devices which belong to two different IP address spaces will not be able to ping each other.