package m31

import "context"

// Client owns one serialized Modbus connection. Connect replaces a closed
// connection and selects a unit from one through 247. Reads must return the
// exact requested count. Writes validate their acknowledgements. All operations
// honor caller cancellation. The driver closes each connection before retry.
// A caller must not use the client concurrently.
type Client interface {
	Connect(ctx context.Context, address string, unit byte) error
	Close() error
	ReadInputs(ctx context.Context, count uint16) ([]bool, error)
	ReadCoils(ctx context.Context, count uint16) ([]bool, error)
	ReadRegisters(ctx context.Context, address uint16, count uint16) ([]uint16, error)
	WriteCoil(ctx context.Context, address uint16, value bool) error
	WriteCoils(ctx context.Context, address uint16, values []bool) error
	WriteRegister(ctx context.Context, address uint16, value uint16) error
}