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[modbus_controller] Writer entities as their own hub device; heap-free, byte-accurate write path (#18082)

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Co-authored-by: J. Nick Koston <nick@koston.org>
This commit is contained in:
Bonne Eggleston
2026-08-26 18:24:09 -05:00
committed by GitHub
co-authored by J. Nick Koston
parent 9508165797
commit 5df1c7f1d3
19 changed files with 598 additions and 235 deletions
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tests/components/modbus_controller/command_payload_test.cpp
+2 -2
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@@ -13,7 +13,7 @@ namespace esphome::modbus_controller::testing {
// malformed. Built at its true byte count, the oversize frame is refused by the hub's size check with
// a log instead.
TEST(ModbusCommandPayload, CoilWritePayloadIsExactSizedNotTruncated) {
ModbusController controller;
ModbusController controller(nullptr, 1);
std::vector<bool> coils(modbus::MAX_NUM_OF_COILS_TO_WRITE + 1, true);
auto cmd = ModbusCommandItem::create_write_multiple_coils(&controller, 0x10, coils);
EXPECT_EQ(cmd.payload.size(), modbus::packed_bit_bytes(coils.size()));
@@ -21,7 +21,7 @@ TEST(ModbusCommandPayload, CoilWritePayloadIsExactSizedNotTruncated) {
// LSB-first packing with zeroed pad bits, matching the wire layout the PDU builders produce.
TEST(ModbusCommandPayload, CoilWritePacksLsbFirstWithZeroPad) {
ModbusController controller;
ModbusController controller(nullptr, 1);
const std::vector<bool> coils{true, false, true, true};
auto cmd = ModbusCommandItem::create_write_multiple_coils(&controller, 0x10, coils);
ASSERT_EQ(cmd.payload.size(), 1u);