Nest is about to give its Learning Thermostat and Protect smoke detector a big potential boost in functionality. The Google-owned company has just launched its developer program and API, which will let anyone write software that can integrate with Nests products. The initiative was first announced last September, but Nests developer portal is now open after a year of work to anyone with a free Nest account. Greg Hu, senior product manager at Nest, said the programs goal was let anyone with a connected platform talk to Nests products.