She clicked "Run."

[j2mod] Slave 1: Read Holding Registers (Function 3) - Address 40001 - Value: 142. Chlorine Level: Optimal.

"You're not obsolete," she said. "You just needed an interpreter."

Elara had found it at 2 AM, buried in a Stack Overflow thread from 2015. It wasn't flashy. It didn't have a fancy logo or a venture-capital-backed GitHub repo. It was just a robust, open-source Java library designed to speak Modbus—both RTU and TCP. It was a translator.

Sully squinted at the new flat-panel display. The water pressure graph updated smoothly. The tank levels were accurate to the tenth of a percent.

"We're live," Elara said.

The fluorescent lights of the server room hummed a low, monotone lullaby. To anyone else, it was the sound of boredom. To Elara, it was the sound of a heartbeat.

And that was the highest praise. Because in the world of water treatment, "the same" means no floods, no dry pipes, and no angry calls from the mayor.

"It feels... different," he grumbled. "But the numbers are the same."