What message did the hero send to his daughter at the end of Interstellar?

All kinds of data of black holes and wormholes they observed were transmitted by Morse code, thus solving the problem of gravity.

Because of these data, we can build a large space station, let human beings immigrate into space, and then find a livable planet to colonize. In fact, the old professor has solved the equation, but without the data in the black hole, he still can't build a large space station, so he implemented plan B. Plan A is a lie to give everyone hope.

Then his daughter asked him to find Amelia. At this time, Amelia discovered a habitable planet and set up a tent. Cooper is on his way, and the movie has an open ending.

Plot:

This paper mainly tells the story of a group of explorers who used their new discoveries about wormholes to go beyond the limits of human space travel and start interstellar travel in the vast universe.

In the film, the hero Cooper sacrifices himself to save the female scientist Amelia, pushes Amelia's flight cabin away, and the reaction falls into a black hole.

After entering the black hole, he met many particles, which destroyed the flight cabin. He fell out and entered the five-dimensional space set by high-tech humans in the future. In five dimensions, time is tangible.

Cooper found that he could communicate with Murphy in five-dimensional space and four-dimensional space, and he could transmit information. Cooper communicated with his daughter at different time periods through his watch, and used Morse code to send the key clues to solve the equation to Murphy Black Hole. Gravitational data was sent back to the earth, which finally saved mankind.