ESPHome 2026.4.0: Lock callback signature changed

[bdraco]

Summary

ESPHome 2026.4.0 changes Lock::add_on_state_callback to pass state as an argument (PR #15199). The callback signature changed from void() to void(LockState).

Current usage

components/homekit/lock.hpp — [this]() zero-arg lambda

Recommended migration

// Before
lock->add_on_state_callback([this]() {
  auto state = lock->state;
  // ...
});

// After
lock->add_on_state_callback([this](LockState state) {
  // state is passed directly
});

References

• ESPHome PR: [lock] Migrate LockStateTrigger to callback automation esphome/esphome#15199
• Developer blog post: Add blog post: Trigger trampolines eliminated (#15174, #15198, #15199, #15200) esphome/developers.esphome.io#122