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[modbus] Add API for reading/writing coils and discrete inputs in server mode (#17264)

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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: J. Nick Koston <nick@koston.org>
This commit is contained in:
Bonne Eggleston
2026-08-10 14:23:49 -05:00
committed by GitHub
co-authored by Claude Fable 5 J. Nick Koston
parent 207ae2e4cb
commit 2999e7b925
12 changed files with 825 additions and 78 deletions
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esphome/components/modbus_controller/modbus_controller.cpp
+11 -8
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@@ -2,6 +2,8 @@
#include "esphome/core/application.h"
#include "esphome/core/log.h"
#include <cstring>
namespace esphome::modbus_controller {
static const char *const TAG = "modbus_controller";
@@ -427,14 +429,15 @@ ModbusCommandItem ModbusCommandItem::create_write_multiple_coils(ModbusControlle
modbusdevice->on_write_register_response(register_type, start_address, data);
};
uint8_t *p = cmd.payload.init((values.size() + 7) / 8);
memset(p, 0, (values.size() + 7) / 8);
size_t bit = 0;
for (auto coil : values) {
if (coil) {
p[bit / 8] |= (1 << (bit % 8));
}
bit++;
// Pack through the shared bit view (MutablePackedBits) so the coil wire layout lives in one place
// instead of an open-coded loop.
const size_t byte_count = modbus::packed_bit_bytes(values.size());
uint8_t *p = cmd.payload.init(byte_count);
memset(p, 0, byte_count);
modbus::MutablePackedBits bits(std::span<uint8_t>(p, byte_count), static_cast<uint16_t>(values.size()));
for (size_t i = 0; i != values.size(); i++) {
if (values[i])
bits.set(i, true);
}
return cmd;
}