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[modbus] Typed client send helpers and response callbacks (#17435)

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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Bonne Eggleston
2026-07-26 13:14:54 -10:00
committed by GitHub
co-authored by Claude Fable 5
parent b395a87cad
commit 67e0058e72
5 changed files with 575 additions and 28 deletions
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esphome/components/modbus/modbus_helpers.cpp
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@@ -420,6 +420,11 @@ PduBuffer create_client_pdu(FunctionCode function_code, uint16_t start_address,
pdu.push_back(values_len); // Byte count is required for write multiple
for (size_t i = 0; i < values_len; i++)
pdu.push_back(values[i]);
// Zero the unused bits of the final byte as the spec requires, matching the typed coil builder
// so both produce identical wire bytes for the same write.
if (bits && number_of_entities % 8 != 0) {
pdu[pdu.size() - 1] &= static_cast<uint8_t>((1 << (number_of_entities % 8)) - 1);
}
return pdu;
}