This message is about a successful radio communication test. A Nokia 3310 (old phone) sent a message via a special radio signal to a device called a CC1200 hotspot. The message was then forwarded through the internet using a UDP packet (a type of data transmission) to a "reflector," which is like a relay station. The shout-outs are to the people who helped make this happen. The "^SP5WWP" is likely the call sign of the person reporting this success. In short, it's a tech-savvy way of saying "we sent a message using old and new tech, and it worked!"