tuning.py

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## @file
## @brief ESPHome tuning schema and code generation for Home IO Control.
## @ingroup hioc_codegen
##
## Provides the YAML ``tuning:`` block under ``home_io_control:`` and optionally
## generates Home Assistant ``number`` and ``select`` entities so users can adjust
## pairing and radio parameters at runtime. Tuned values are volatile and reset on
## every boot.
 
import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import number, select
from esphome.const import CONF_ID, CONF_NAME, ENTITY_CATEGORY_CONFIG
from esphome.core import ID
 
home_io_control_ns = cg.esphome_ns.namespace("home_io_control")
 
CONF_TUNING = "tuning"
CONF_UI_CONTROLS = "ui_controls"
 
# Fixed ID prefix for the generated tuning companion entities (see _inject_tuning_companion_ids).
_COMPANION_ID_BASE = "home_io_control"
 
# --- Radio / physical layer ---
CONF_SX1262_RX_BANDWIDTH = "sx1262_rx_bandwidth"
CONF_SX1262_RESPONSE_PREAMBLE = "sx1262_response_preamble"
CONF_SX1262_POST_TX_SETTLE_US = "sx1262_post_tx_settle_us"
CONF_SX1276_RX_BANDWIDTH = "sx1276_rx_bandwidth"
CONF_SX1276_RESPONSE_PREAMBLE = "sx1276_response_preamble"
CONF_SX1276_DISCOVERY_HOP_SLICE_MS = "sx1276_discovery_hop_slice_ms"
CONF_SX1262_DISCOVERY_HOP_SLICE_MS = "sx1262_discovery_hop_slice_ms"
CONF_LR1121_RX_BANDWIDTH = "lr1121_rx_bandwidth"
CONF_LR1121_RESPONSE_PREAMBLE = "lr1121_response_preamble"
CONF_LR1121_POST_TX_SETTLE_US = "lr1121_post_tx_settle_us"
CONF_LR1121_DISCOVERY_HOP_SLICE_MS = "lr1121_discovery_hop_slice_ms"
CONF_COLD_BROADCAST_REPLY_PREAMBLE = "cold_broadcast_reply_preamble"
CONF_NORMAL_START_PREAMBLE = "normal_start_preamble"
CONF_LBT_MAX_RETRIES = "lbt_max_retries"
CONF_LBT_RSSI_THRESHOLD_DBM = "lbt_rssi_threshold_dbm"
CONF_LOW_POWER_WAKE_BELIEF = "low_power_wake_belief"
CONF_EXCHANGE_START_RESPONSE_WAIT_MS = "exchange_start_response_wait_ms"
CONF_EXCHANGE_RESPONSE_WAIT_MS = "exchange_response_wait_ms"
CONF_EXCHANGE_TOTAL_BUDGET_MS = "exchange_total_budget_ms"
 
# --- Pairing protocol ---
CONF_PAIRING_DISCOVERY_COMMANDS = "pairing_discovery_commands"
CONF_PAIRING_DISCOVERY_DESTINATION = "pairing_discovery_destination"
CONF_PAIRING_DISCOVERY_PAYLOAD = "pairing_discovery_payload"
CONF_PAIRING_DISCOVERY_LOW_POWER = "pairing_discovery_low_power"
CONF_PAIRING_DISCOVERY_ACK_CAPABLE = "pairing_discovery_ack_capable"
CONF_PAIRING_DISCOVERY_PREAMBLE = "pairing_discovery_preamble"
CONF_PAIRING_DISCOVERY_WAIT_MS = "pairing_discovery_wait_ms"
CONF_PAIRING_DISCOVERY_INITIAL_DWELL_MS = "pairing_discovery_initial_dwell_ms"
CONF_PAIRING_KEY_EXCHANGE_RETRIES = "pairing_key_exchange_retries"
CONF_SCAN_POWER_CLASSES = "scan_power_classes"
CONF_PAIRING_DISCOVER_CONFIRM = "pairing_discover_confirm"
CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS = "pairing_discovery_listen_channels"
CONF_PAIRING_KEY_INIT_DELAY_MS = "pairing_key_init_delay_ms"
 
# C++ type references
TuningConfig = home_io_control_ns.class_("TuningConfig")
IOHomeTuningNumber = home_io_control_ns.class_(
    "IOHomeTuningNumber", number.Number, cg.Component
)
IOHomeTuningSelect = home_io_control_ns.class_(
    "IOHomeTuningSelect", select.Select, cg.Component
)
 
# C++ enums. These stringify to their fully-qualified C++ names (e.g.
# esphome::home_io_control::SX1262RxBandwidth::BW_117_3_KHZ) so generated code compiles in
# the global-namespace setup() function.
SX1262RxBandwidth = home_io_control_ns.enum("SX1262RxBandwidth", is_class=True)
SX1276RxBandwidth = home_io_control_ns.enum("SX1276RxBandwidth", is_class=True)
LR1121RxBandwidth = home_io_control_ns.enum("LR1121RxBandwidth", is_class=True)
DiscoveryCommand = home_io_control_ns.enum("DiscoveryCommand", is_class=True)
ScanPowerClasses = home_io_control_ns.enum("ScanPowerClasses", is_class=True)
DiscoverConfirmMode = home_io_control_ns.enum("DiscoverConfirmMode", is_class=True)
DiscoveryListenChannels = home_io_control_ns.enum("DiscoveryListenChannels", is_class=True)
 
# Map each YAML option string to its C++ enum value. Options are bare kHz numbers (the "kHz"
# unit lives in the entity name) for uniformity with the numeric parameters.
SX1262_BANDWIDTH_OPTIONS = {
    "39.0": SX1262RxBandwidth.BW_39_0_KHZ,
    "46.9": SX1262RxBandwidth.BW_46_9_KHZ,
    "58.6": SX1262RxBandwidth.BW_58_6_KHZ,
    "78.2": SX1262RxBandwidth.BW_78_2_KHZ,
    "117.3": SX1262RxBandwidth.BW_117_3_KHZ,
    "156.2": SX1262RxBandwidth.BW_156_2_KHZ,
    "187.2": SX1262RxBandwidth.BW_187_2_KHZ,
}
 
SX1276_BANDWIDTH_OPTIONS = {
    "20.8": SX1276RxBandwidth.BW_20_8_KHZ,
    "41.7": SX1276RxBandwidth.BW_41_7_KHZ,
    "62.5": SX1276RxBandwidth.BW_62_5_KHZ,
    "83.3": SX1276RxBandwidth.BW_83_3_KHZ,
    "125.0": SX1276RxBandwidth.BW_125_0_KHZ,
}
 
# LR1121 shares the Semtech GFSK bandwidth grid with SX1262, so LR1121RxBandwidth is
# byte-for-byte identical to SX1262RxBandwidth today (tuning_config.h; the
# Sx1262AndLr1121BandwidthTablesAgree test pins them together). They are kept as separate C++
# enums, and separate option dicts here, only so each chip's option set can diverge if a real
# chip difference ever demands it. The two narrowest options (39.0/46.9 kHz) are offered on
# both chips for probing below the SX1262 default; both sit well below the 76.8 kHz (DSB)
# sizing floor for this waveform, so neither suits everyday use.
LR1121_BANDWIDTH_OPTIONS = {
    "39.0": LR1121RxBandwidth.BW_39_0_KHZ,
    "46.9": LR1121RxBandwidth.BW_46_9_KHZ,
    "58.6": LR1121RxBandwidth.BW_58_6_KHZ,
    "78.2": LR1121RxBandwidth.BW_78_2_KHZ,
    "117.3": LR1121RxBandwidth.BW_117_3_KHZ,
    "156.2": LR1121RxBandwidth.BW_156_2_KHZ,
    "187.2": LR1121RxBandwidth.BW_187_2_KHZ,
}
 
DISCOVERY_COMMAND_OPTIONS = {
    "0x28": DiscoveryCommand.DISCOVER,
    "0x2E": DiscoveryCommand.DISCOVER_ALT,
}
# 0x2A (CMD_DISCOVER_SPE_REQ) is deliberately excluded: it is a roll-call answered only by devices
# that already hold the controller's system key, so a device in learning mode never answers it.
# Offering it here could only add replies from already-paired devices to a pairing attempt, never
# help reach the unpaired one. The command byte itself stays valid — see
# DiscoveryCommand::DISCOVER_SPE in tuning_config.h.
 
# Home Assistant `select` entities are single-choice, but the discovery phase can send an
# ordered list of commands. These comma-separated presets expose the useful combinations as
# selectable options; the C++ dispatch (update_tuning_select) parses them back into the vector.
DISCOVERY_COMMAND_PRESETS = [
    "0x28",  # default 2W discovery
    "0x2E",  # alternate discovery — kept for completeness/experimentation, but broadcast 0x2E has
             # never drawn a response from any device this project has real evidence for; see the
             # CMD_DISCOVER_ALT_REQ doc comment in proto_constants.h. Not a recommended fix.
    "0x28,0x2E",  # both broadcasts
]
 
# Destinations a discovery broadcast may be addressed to. The first three are the class-less
# forms every controller in this project's corpus uses — a real Somfy TaHoma Switch's own 0x28
# goes to 0x00003B (corpus: somfy_tahoma_pairing_key_extraction_success_sx1276).
#
# The 0x0001xx pair are *typed* broadcasts for the lighting class: an io broadcast address encodes
# the device type as (type << 6) | subtype-mask, so LIGHT (0x06) gives 0x0001BF with the
# all-subtypes mask 0x3F and 0x0001BB with discovery's 0x3B. They are offered because the only
# system-opening sweep in the corpus is typed by class — a VELUX KLI 313 hitting 0x0000BF /
# 0x0000FF / 0x00037F (roller_shutter / awning / dual_shutter) in
# velux_ssl_discovery_tahoma_pairing — while every discovery this project sends is class-less.
# No capture shows a *hub* sourcing a typed discovery, so these are an experiment, not a fix.
DISCOVERY_DESTINATION_OPTIONS = [
    "auto",
    "0x00003B",
    "0x00003F",
    "0x0001BB",
    "0x0001BF",
]
 
PAIRING_DISCOVERY_PAYLOAD_OPTIONS = ["none", "0x00"]
 
# Which power classes scan_paired_devices() calls. Option strings mirror the roll-call report's
# power_save= values so the two share one vocabulary; the C++ side of these exact strings is
# scan_power_classes_to_string() / power_save_mode_name() (tuning_config.h / proto_constants.h),
# pinned against each other by tuning_registry_test.cpp — there is no build-time gate comparing
# the Python and C++ strings directly.
SCAN_POWER_CLASSES_OPTIONS = {
    "both": ScanPowerClasses.BOTH,
    "always_alive": ScanPowerClasses.ALWAYS_ALIVE,
    "low_power": ScanPowerClasses.LOW_POWER,
}
 
# Whether/how PairingEngine sends CMD_DISCOVER_CONFIRM (0x2C) during pairing. Option strings
# mirror discover_confirm_mode_to_string() (tuning_config.h), pinned against each other by
# tuning_registry_test.cpp the same way SCAN_POWER_CLASSES_OPTIONS is — there is no build-time gate
# comparing the Python and C++ strings directly. "skip"/"send"/"send_with_ack", not "on"/"off":
# YAML 1.1 turns bare on/off into booleans.
DISCOVER_CONFIRM_MODE_OPTIONS = {
    "skip": DiscoverConfirmMode.SKIP,
    "send": DiscoverConfirmMode.SEND,
    "send_with_ack": DiscoverConfirmMode.SEND_WITH_ACK,
}
 
# Which channels the discovery response wait covers. `skip_request` (default) listens on the two
# channels that are not the one the request went out on; `all` includes it, at the cost of a third
# of the dwell on the other two. See DiscoveryListenChannels in tuning_config.h for why the
# default skips, and why that reasoning cannot settle the case of a device that never answers.
DISCOVERY_LISTEN_CHANNELS_OPTIONS = {
    "skip_request": DiscoveryListenChannels.SKIP_REQUEST,
    "all": DiscoveryListenChannels.ALL,
}
 
 
def _id_key(param_key):
    """Config-dict key under which a parameter's injected companion entity ID is stored."""
    return f"_{param_key}_id"
 
 
# UI entity names. Radio params are prefixed "Radio" and pairing params "Pairing" so that,
# under Home Assistant's Configuration section (entity_category=config), the two logical groups
# cluster together alphabetically.
UI_NAMES = {
    CONF_SX1262_RX_BANDWIDTH: "Radio SX1262 RX Bandwidth (kHz)",
    CONF_SX1262_RESPONSE_PREAMBLE: "Radio SX1262 Response Preamble",
    CONF_SX1262_POST_TX_SETTLE_US: "Radio SX1262 Post-TX Settle",
    CONF_SX1276_RX_BANDWIDTH: "Radio SX1276 RX Bandwidth (kHz)",
    CONF_SX1276_RESPONSE_PREAMBLE: "Radio SX1276 Response Preamble",
    CONF_SX1276_DISCOVERY_HOP_SLICE_MS: "Radio SX1276 Discovery Hop Slice",
    CONF_SX1262_DISCOVERY_HOP_SLICE_MS: "Radio SX1262 Discovery Hop Slice",
    CONF_LR1121_RX_BANDWIDTH: "Radio LR1121 RX Bandwidth (kHz)",
    CONF_LR1121_RESPONSE_PREAMBLE: "Radio LR1121 Response Preamble",
    CONF_LR1121_POST_TX_SETTLE_US: "Radio LR1121 Post-TX Settle",
    CONF_LR1121_DISCOVERY_HOP_SLICE_MS: "Radio LR1121 Discovery Hop Slice",
    CONF_COLD_BROADCAST_REPLY_PREAMBLE: "Radio Cold Broadcast Reply Preamble",
    CONF_NORMAL_START_PREAMBLE: "Radio Normal Start Preamble",
    CONF_LBT_MAX_RETRIES: "Radio LBT Max Retries",
    CONF_LBT_RSSI_THRESHOLD_DBM: "Radio LBT RSSI Threshold",
    CONF_LOW_POWER_WAKE_BELIEF: "Radio Low Power Wake Belief",
    CONF_EXCHANGE_START_RESPONSE_WAIT_MS: "Exchange Start Response Wait",
    CONF_EXCHANGE_RESPONSE_WAIT_MS: "Exchange Response Wait",
    CONF_EXCHANGE_TOTAL_BUDGET_MS: "Exchange Total Budget",
    CONF_PAIRING_DISCOVERY_COMMANDS: "Pairing Discovery Commands",
    CONF_PAIRING_DISCOVERY_DESTINATION: "Pairing Discovery Destination",
    CONF_PAIRING_DISCOVERY_PAYLOAD: "Pairing Discovery Payload",
    CONF_PAIRING_DISCOVERY_LOW_POWER: "Pairing Discovery Low Power",
    CONF_PAIRING_DISCOVERY_ACK_CAPABLE: "Pairing Discovery ACK Capable",
    CONF_PAIRING_DISCOVERY_PREAMBLE: "Pairing Discovery Preamble",
    CONF_PAIRING_DISCOVERY_WAIT_MS: "Pairing Discovery Wait",
    CONF_PAIRING_DISCOVERY_INITIAL_DWELL_MS: "Pairing Discovery Initial Dwell",
    CONF_PAIRING_KEY_EXCHANGE_RETRIES: "Pairing Key Exchange Retries",
    CONF_SCAN_POWER_CLASSES: "Pairing Scan Power Classes",
    CONF_PAIRING_DISCOVER_CONFIRM: "Pairing Discover Confirm",
    CONF_PAIRING_KEY_INIT_DELAY_MS: "Pairing Key Init Delay",
    CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS: "Pairing Discovery Listen Channels",
}
 
# Numeric parameters: key -> (min, max, step, unit). Single source of truth for both the
# YAML validation range and the Home Assistant `number` entity bounds, so the two cannot drift.
_NUMBER_PARAMS = {
    # Floor is 8, not an arbitrary round number: it's SHORT_PREAMBLE, the protocol's own nominal
    # preamble length and the lowest value that makes sense to transmit (below it there isn't
    # enough preamble left for the peer's detector to lock on at all). Same floor as
    # sx1276_response_preamble below.
    CONF_SX1262_RESPONSE_PREAMBLE: (8, 256, 1, "B"),
    CONF_SX1262_POST_TX_SETTLE_US: (0, 2000, 10, "µs"),
    CONF_SX1276_RESPONSE_PREAMBLE: (8, 256, 1, "B"),
    CONF_SX1276_DISCOVERY_HOP_SLICE_MS: (5, 200, 1, "ms"),
    # Floor is 0, not a physically meaningful minimum for the chip: coverage degrades gradually as
    # the dwell shortens and only truly collapses at the literal 0 ms edge case, where
    # wait_for_packet(..., 0) returns before any guard can observe activity at all. Left open so
    # that floor stays empirically checkable rather than assumed. See
    # SX1262_DISCOVERY_HOP_SLICE_MS in tuning_config.h for why the default itself is short.
    CONF_SX1262_DISCOVERY_HOP_SLICE_MS: (0, 500, 1, "ms"),
    # LR1121 numeric ranges reuse the SX1262 bounds — same chip-family physical constraints, and
    # a validated SX1262 value encodes protocol-side reality more than a chip quirk.
    CONF_LR1121_RESPONSE_PREAMBLE: (8, 256, 1, "B"),
    CONF_LR1121_POST_TX_SETTLE_US: (0, 2000, 10, "µs"),
    CONF_LR1121_DISCOVERY_HOP_SLICE_MS: (0, 500, 1, "ms"),
    # Same (8, 256) floor/ceiling as sx1262_response_preamble above, for the same reason: 8 is
    # SHORT_PREAMBLE, the lowest value that leaves the peer's detector anything to lock on to.
    # This field is chip-neutral (see proto_timing.h COLD_BROADCAST_REPLY_PREAMBLE, which lives
    # there rather than in tuning_config.h precisely because it is chip-neutral -- see that header's
    # own "chip-neutral defaults live in proto_timing.h" comment) so it has no per-chip range to
    # inherit the way lr1121_response_preamble does.
    CONF_COLD_BROADCAST_REPLY_PREAMBLE: (8, 256, 1, "B"),
    # Same (8, 256) floor/ceiling as the response-preamble params: 8 is SHORT_PREAMBLE, the lowest
    # value that leaves the peer's detector anything to lock on to. The default is 32
    # (NORMAL_START_PREAMBLE in proto_timing.h) -- 256 bits, inside the preamble band the protocol
    # reference documents -- not 8: brand-new devices have been seen failing at 1/4/8 B
    # (docs/configuration/tuning.md), so 8 is a proven-safe floor for the knob, not a sensible default.
    CONF_NORMAL_START_PREAMBLE: (8, 256, 1, "B"),
    # Floor is 8 (SHORT_PREAMBLE), same reasoning as the response-preamble params above. Ceiling is
    # the current default (LONG_PREAMBLE, 1024) rather than 256 like the other preamble knobs: this
    # one exists specifically to let a stuck pairing attempt go *shorter* than the long wake-up
    # burst (issue #27/#87's precedent), not to go longer than it — nothing calls for raising it
    # further.
    CONF_PAIRING_DISCOVERY_PREAMBLE: (8, 1024, 1, "B"),
    CONF_LBT_MAX_RETRIES: (0, 10, 1, ""),
    CONF_LBT_RSSI_THRESHOLD_DBM: (-95, -70, 1, "dBm"),
    # Ceilings are generous because the right value is a property of the target device, not of
    # the radio: measured RS100 solar reply latencies reach ~3 s (see RESPONSE_START_WAIT_MS).
    # Every millisecond here is loop-blocking time on a *failed* exchange only (ADR 0013).
    CONF_EXCHANGE_START_RESPONSE_WAIT_MS: (200, 4000, 50, "ms"),
    CONF_EXCHANGE_RESPONSE_WAIT_MS: (200, 4000, 50, "ms"),
    # Ceiling on a whole exchange. Every millisecond over ~2550 blocks the ESPHome loop past its
    # own warning threshold, so raise this only when persistence matters more than responsiveness.
    CONF_EXCHANGE_TOTAL_BUDGET_MS: (500, 12000, 100, "ms"),
    CONF_PAIRING_DISCOVERY_WAIT_MS: (500, 5000, 50, "ms"),
    CONF_PAIRING_DISCOVERY_INITIAL_DWELL_MS: (0, 500, 10, "ms"),
    CONF_PAIRING_KEY_EXCHANGE_RETRIES: (1, 5, 1, ""),
    # Ceiling covers KLR300's observed 0x2C -> 0x31 gap (~8.1 s) with headroom; step 100 matches
    # the other pairing-phase millisecond knobs.
    CONF_PAIRING_KEY_INIT_DELAY_MS: (0, 10000, 100, "ms"),
}
 
# Plain boolean parameters: the C++ TuningConfig field name equals the YAML key, and every one is
# a simple On/Off select — driving the schema, the select options, and the to_code() assignment
# from one list each, the same way _NUMBER_PARAMS drives the numeric ones below.
#
# pairing_discovery_ack_capable is opt-in: see the init_frame() doc in proto_frame.h for why
# CTRL1_ACK must never become an unconditional default. This knob scopes it to the discovery
# broadcast only, off by default.
#
# low_power_wake_belief is the opposite: on by default, and a diagnostic off-switch. Setting it to
# false restores the fixed long wake-up preamble on every try to a low_power device.
_BOOL_PARAMS = (CONF_PAIRING_DISCOVERY_LOW_POWER, CONF_PAIRING_DISCOVERY_ACK_CAPABLE, CONF_LOW_POWER_WAKE_BELIEF)
_BOOL_SELECT_OPTIONS = ["Off", "On"]
 
# Select parameters: key -> ordered option list. Single source of truth for both the
# companion-ID injection and the entity creation.
_SELECT_OPTIONS = {
    CONF_PAIRING_DISCOVERY_COMMANDS: DISCOVERY_COMMAND_PRESETS,
    CONF_PAIRING_DISCOVERY_DESTINATION: DISCOVERY_DESTINATION_OPTIONS,
    CONF_PAIRING_DISCOVERY_PAYLOAD: PAIRING_DISCOVERY_PAYLOAD_OPTIONS,
    # check-tuning-sync.py's AST scan only understands plain `CONF_*: value` entries in this dict
    # (no `**` unpacking), so the boolean rows stay written out individually here even though
    # _BOOL_PARAMS drives the schema and to_code() loops below.
    CONF_PAIRING_DISCOVERY_LOW_POWER: _BOOL_SELECT_OPTIONS,
    CONF_PAIRING_DISCOVERY_ACK_CAPABLE: _BOOL_SELECT_OPTIONS,
    CONF_SX1262_RX_BANDWIDTH: list(SX1262_BANDWIDTH_OPTIONS),
    CONF_SX1276_RX_BANDWIDTH: list(SX1276_BANDWIDTH_OPTIONS),
    CONF_LR1121_RX_BANDWIDTH: list(LR1121_BANDWIDTH_OPTIONS),
    CONF_LOW_POWER_WAKE_BELIEF: _BOOL_SELECT_OPTIONS,
    CONF_SCAN_POWER_CLASSES: list(SCAN_POWER_CLASSES_OPTIONS),
    CONF_PAIRING_DISCOVER_CONFIRM: list(DISCOVER_CONFIRM_MODE_OPTIONS),
    CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS: list(DISCOVERY_LISTEN_CHANNELS_OPTIONS),
}
 
 
def _one_of_string(param_name, options, coerce_number=False):
    """Build a validator that requires a string value present in `options`.
 
    Works for both list and dict `options` (dict membership tests the keys), so a single
    factory replaces a hand-written validator per option set while keeping a per-parameter
    error message. With `coerce_number`, a numeric YAML value (e.g. ``117.3``) is accepted and
    normalized to its string form, so bare-number options do not force the user to quote them.
    """
 
    def validate(value):
        if coerce_number and isinstance(value, (int, float)) and not isinstance(value, bool):
            value = str(value)
        value = cv.string_strict(value)
        if value not in options:
            raise cv.Invalid(f"{param_name} must be one of {list(options)}")
        return value
 
    return validate
 
 
_validate_bandwidth = _one_of_string(
    CONF_SX1262_RX_BANDWIDTH, SX1262_BANDWIDTH_OPTIONS, coerce_number=True
)
_validate_sx1276_bandwidth = _one_of_string(
    CONF_SX1276_RX_BANDWIDTH, SX1276_BANDWIDTH_OPTIONS, coerce_number=True
)
_validate_lr1121_bandwidth = _one_of_string(
    CONF_LR1121_RX_BANDWIDTH, LR1121_BANDWIDTH_OPTIONS, coerce_number=True
)
_validate_discovery_command = _one_of_string(
    f"{CONF_PAIRING_DISCOVERY_COMMANDS} entries", DISCOVERY_COMMAND_OPTIONS
)
_validate_discovery_destination = _one_of_string(
    CONF_PAIRING_DISCOVERY_DESTINATION, DISCOVERY_DESTINATION_OPTIONS
)
_validate_discovery_payload = _one_of_string(
    CONF_PAIRING_DISCOVERY_PAYLOAD, PAIRING_DISCOVERY_PAYLOAD_OPTIONS
)
_validate_scan_power_classes = _one_of_string(
    CONF_SCAN_POWER_CLASSES, SCAN_POWER_CLASSES_OPTIONS
)
_validate_discover_confirm_mode = _one_of_string(
    CONF_PAIRING_DISCOVER_CONFIRM, DISCOVER_CONFIRM_MODE_OPTIONS
)
_validate_discovery_listen_channels = _one_of_string(
    CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS, DISCOVERY_LISTEN_CHANNELS_OPTIONS
)
 
 
def _parse_destination_to_bytes(value):
    """Convert an explicit destination string like '0x00003B' to a list of 3 byte values."""
    digits = value[2:]  # strip the '0x' prefix
    return [int(digits[i : i + 2], 16) for i in range(0, 6, 2)]
 
 
def _parse_payload(value):
    """Convert a payload option string like '0x00' to its numeric byte value."""
    return int(value, 16)
 
 
# Tuning sub-schema (imported and extended by the hub __init__.py).
#
# Only `ui_controls` carries a Python default (it is a feature toggle, not a tunable). Every
# tunable is a plain cv.Optional with NO default: when a key is omitted, the C++ TuningConfig
# field keeps its canonical default from proto_frame.h, which is the single source of truth.
# to_code() only overrides fields that are actually present in the validated config.
TUNING_SCHEMA = cv.Schema(
    {
        cv.Optional(CONF_UI_CONTROLS, default=False): cv.boolean,
        cv.Optional(CONF_SX1262_RX_BANDWIDTH): _validate_bandwidth,
        cv.Optional(CONF_SX1276_RX_BANDWIDTH): _validate_sx1276_bandwidth,
        cv.Optional(CONF_LR1121_RX_BANDWIDTH): _validate_lr1121_bandwidth,
        cv.Optional(CONF_PAIRING_DISCOVERY_COMMANDS): cv.All(
            cv.ensure_list(_validate_discovery_command),
            cv.Length(min=1),
        ),
        cv.Optional(CONF_PAIRING_DISCOVERY_DESTINATION): _validate_discovery_destination,
        cv.Optional(CONF_PAIRING_DISCOVERY_PAYLOAD): _validate_discovery_payload,
        cv.Optional(CONF_SCAN_POWER_CLASSES): _validate_scan_power_classes,
        cv.Optional(CONF_PAIRING_DISCOVER_CONFIRM): _validate_discover_confirm_mode,
        cv.Optional(
            CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS
        ): _validate_discovery_listen_channels,
        **{cv.Optional(key): cv.boolean for key in _BOOL_PARAMS},
        # Numeric parameters share their range with the number-entity bounds via _NUMBER_PARAMS.
        **{
            cv.Optional(key): cv.int_range(min=lo, max=hi)
            for key, (lo, hi, _step, _unit) in _NUMBER_PARAMS.items()
        },
    }
)
 
 
def _inject_tuning_companion_ids(config):
    """Declare companion entity IDs for tuning UI controls.
 
    ESPHome 2026.x sizes the runtime component vector from the number of IDs
    declared during validation. If UI entities were created only in to_code(),
    they could be silently dropped. This post-validator injects declared IDs
    before the vector is sized.
    """
    if not config[CONF_UI_CONTROLS]:
        return config
 
    # The tuning block is a sub-schema of home_io_control and does not carry the parent's
    # CONF_ID, so the companion entity IDs use a fixed prefix. It only needs to be unique
    # among the generated tuning entities.
    base = _COMPANION_ID_BASE
 
    for key in _SELECT_OPTIONS:
        config[_id_key(key)] = ID(f"{base}_{key}", is_declaration=True, type=IOHomeTuningSelect)
    for key in _NUMBER_PARAMS:
        config[_id_key(key)] = ID(f"{base}_{key}", is_declaration=True, type=IOHomeTuningNumber)
 
    return config
 
 
TUNING_CONFIG_SCHEMA = cv.All(TUNING_SCHEMA, _inject_tuning_companion_ids)
 
 
def _cpp_bool(value):
    """Format a Python bool as a C++ boolean literal."""
    return "true" if value else "false"
 
 
def _assign(struct, field, value):
    """Emit a `struct.field = value;` C++ assignment statement at codegen time.
 
    ESPHome's MockObj does not support Python attribute assignment, so struct fields
    are populated with raw assignment statements. `value` must already be valid C++
    (an int, or a string such as an enum value or brace-init list).
    """
    cg.add(cg.RawExpression(f"{struct}.{field} = {value}"))
 
 
def _apply_tuning_config(config, var):
    """Generate C++ code that builds a TuningConfig from the validated YAML.
 
    Only keys the user actually provided are emitted; every omitted key keeps the
    default baked into the C++ TuningConfig struct (sourced from proto_frame.h), so
    the defaults are never restated here.
    """
    tuning_id = cv.declare_id(TuningConfig)("tuning_config")
    tuning = cg.new_variable(tuning_id, cg.RawExpression(f"{TuningConfig}()"))
 
    # Presence of the block is what activates the override layer.
    _assign(tuning, "active", "true")
 
    # --- Parameters needing custom handling (enum/list/byte/bool) ---
    if CONF_SX1262_RX_BANDWIDTH in config:
        _assign(
            tuning,
            "sx1262_rx_bandwidth",
            SX1262_BANDWIDTH_OPTIONS[config[CONF_SX1262_RX_BANDWIDTH]],
        )
 
    if CONF_SX1276_RX_BANDWIDTH in config:
        _assign(
            tuning,
            "sx1276_rx_bandwidth",
            SX1276_BANDWIDTH_OPTIONS[config[CONF_SX1276_RX_BANDWIDTH]],
        )
 
    if CONF_LR1121_RX_BANDWIDTH in config:
        _assign(
            tuning,
            "lr1121_rx_bandwidth",
            LR1121_BANDWIDTH_OPTIONS[config[CONF_LR1121_RX_BANDWIDTH]],
        )
 
    if CONF_SCAN_POWER_CLASSES in config:
        _assign(
            tuning,
            "scan_power_classes",
            SCAN_POWER_CLASSES_OPTIONS[config[CONF_SCAN_POWER_CLASSES]],
        )
 
    if CONF_PAIRING_DISCOVER_CONFIRM in config:
        _assign(
            tuning,
            "pairing_discover_confirm",
            DISCOVER_CONFIRM_MODE_OPTIONS[config[CONF_PAIRING_DISCOVER_CONFIRM]],
        )
 
    if CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS in config:
        _assign(
            tuning,
            "pairing_discovery_listen_channels",
            DISCOVERY_LISTEN_CHANNELS_OPTIONS[
                config[CONF_PAIRING_DISCOVERY_LISTEN_CHANNELS]
            ],
        )
 
    # Ordered discovery commands. Clear the struct default before appending so a
    # user-provided list replaces it rather than extending it.
    if CONF_PAIRING_DISCOVERY_COMMANDS in config:
        cg.add(tuning.pairing_discovery_commands.clear())
        for cmd in config[CONF_PAIRING_DISCOVERY_COMMANDS]:
            cg.add(
                tuning.pairing_discovery_commands.push_back(
                    DISCOVERY_COMMAND_OPTIONS[cmd]
                )
            )
 
    if CONF_PAIRING_DISCOVERY_DESTINATION in config:
        dest = config[CONF_PAIRING_DISCOVERY_DESTINATION]
        if dest == "auto":
            _assign(tuning, "pairing_discovery_destination_auto", "true")
        else:
            _assign(tuning, "pairing_discovery_destination_auto", "false")
            b = _parse_destination_to_bytes(dest)
            _assign(
                tuning,
                "pairing_discovery_destination",
                f"{{0x{b[0]:02X}, 0x{b[1]:02X}, 0x{b[2]:02X}}}",
            )
 
    if CONF_PAIRING_DISCOVERY_PAYLOAD in config:
        payload = config[CONF_PAIRING_DISCOVERY_PAYLOAD]
        if payload == "none":
            _assign(tuning, "pairing_discovery_payload_enabled", "false")
        else:
            _assign(tuning, "pairing_discovery_payload_enabled", "true")
            _assign(tuning, "pairing_discovery_payload", f"0x{_parse_payload(payload):02X}")
 
    # --- Plain boolean parameters: the C++ struct field name equals the YAML key. ---
    for key in _BOOL_PARAMS:
        if key in config:
            _assign(tuning, key, _cpp_bool(config[key]))
 
    # --- Plain integer parameters: the C++ struct field name equals the YAML key. ---
    for key in _NUMBER_PARAMS:
        if key in config:
            _assign(tuning, key, config[key])
 
    # Emitted under the same condition as the value above, and deliberately next to it: the flag
    # tells setup() the user picked this value, so the radio driver's default must not replace it
    # (ADR 0042). "The user chose 32" and "nobody chose anything" are indistinguishable from the
    # value alone, which is why a second field exists at all.
    if CONF_NORMAL_START_PREAMBLE in config:
        _assign(tuning, "normal_start_preamble_from_yaml", "true")
 
    cg.add(var.set_tuning_config(tuning))
 
 
async def _create_tuning_entities(config, var):
    """Generate number/select entities for the tuning parameters when enabled."""
    if not config[CONF_UI_CONTROLS]:
        return
 
    # --- Select entities (options sourced from _SELECT_OPTIONS) ---
    for key, options in _SELECT_OPTIONS.items():
        await _create_select(config, var, key, options)
 
    # --- Number entities (bounds sourced from _NUMBER_PARAMS) ---
    for key, (min_value, max_value, step, unit) in _NUMBER_PARAMS.items():
        await _create_number(
            config, var, key, min_value=min_value, max_value=max_value, step=step, unit=unit
        )
 
 
async def _create_number(
    config, var, key, min_value, max_value, step, unit=""
):
    """Create a single IOHomeTuningNumber entity.
 
    The bare {id, name} dict is normalized through number_schema()+COMPONENT_SCHEMA so it
    carries the entity/component defaults (disabled_by_default, setup_priority, ...) that
    register_number()/register_component() require.
    """
    schema = number.number_schema(
        IOHomeTuningNumber,
        unit_of_measurement=unit,
        entity_category=ENTITY_CATEGORY_CONFIG,
    )
    entity_config = schema.extend(cv.COMPONENT_SCHEMA)(
        {
            CONF_ID: config[_id_key(key)],
            CONF_NAME: UI_NAMES[key],
        }
    )
    entity = await number.new_number(
        entity_config,
        var,
        key,
        min_value=min_value,
        max_value=max_value,
        step=step,
    )
    await cg.register_component(entity, entity_config)
 
 
async def _create_select(config, var, key, options):
    """Create a single IOHomeTuningSelect entity.
 
    The bare {id, name} dict is normalized through select_schema()+COMPONENT_SCHEMA so it
    carries the entity/component defaults that register_select()/register_component() require.
    """
    entity_config = select.select_schema(
        IOHomeTuningSelect, entity_category=ENTITY_CATEGORY_CONFIG
    ).extend(cv.COMPONENT_SCHEMA)(
        {
            CONF_ID: config[_id_key(key)],
            CONF_NAME: UI_NAMES[key],
        }
    )
    entity = await select.new_select(
        entity_config,
        var,
        key,
        options=options,
    )
    await cg.register_component(entity, entity_config)
 
 
async def to_code(config, var):
    """Generate code for the tuning block."""
    _apply_tuning_config(config, var)
    await _create_tuning_entities(config, var)