If you buy the new Pro2, you need to know that the default network address is 192.168.16.200. Therefore, if the network class of your intranet is different (for example 192.168.0.x ) it is necessary to change the IP address of the radio.
To do this you need to follow the following steps:
1- Connect the computer directly (not through the router) to the radio through an ethernet cable.
2- Configure the computer's network card to use an IP address of the same class as the radio, for example 192.168.16.15.
3- Restart the computer and, if the radio was on, you should turn it off and on again.
4- Start ESSDR and, from the Opetions-Devices-> menu, search for the radio.
5- Once the radio has been found, click on the Use button and then move to the Expert panel.
6- In the New IP Address area set the new IP address (possibly also the port) and click on the Set IP Address button. For example you can give the address 192.168.0.12.
7- Close EESDR and turn off the radio.
8- Return to the computer's network settings and restore the default settings (those that allow the PC to connect to your intranet).
9- Restart the computer.
10- In the meantime connect the radio to the router and turn it back on.
11- Check that the computer is on the network and that the LED of the Sun is green. At this point, by opening EESDR it will be possible to start using the radio.
If you buy a used radio, it is advisable to communicate the last IP address assigned to the radio or you will be forced to perform a hardware reset to ensure that the address is the default.
The process just described is the same that can be followed in the video below.
To avoid connection problems, it is advisable that the computer and radio are connected to the router via an ethernet cable. The use of wifi can be a solution provided that in the home network there are no other devices that are displaying videos or using the network to make a sustained streaming. Typical cases are videos displayed on smartphones or smart TVs and game consoles, such as PlayStation, X-Box and Wii, which heavily engage the network.
Another trick to use is to intervene on the home router by reducing the pool of addresses that can be assigned by the DHCP server. The configuration I use in my intranet sees a pool of IP addresses ranging from 192.168.10.31 to 192.168.10.230. Addresses below 31 are reserved (via the mac address) from the devices I use for the radio (in my case SunSDR, station computer, station controller with arduino and rotor). Addresses above 230 are booked by other home devices such as wifi extender, games console and smart TVs. In this way there is no possibility of network conflicts occurring and above all we will be certain that some particular devices will always have the same network address.
https://www.instructables.com/Setup-and-Connection-of-SunSDR2-Pro/