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[modbus] Modbus server role: write holding registers (#9156)

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This commit is contained in:
Javier Peletier
2025-07-01 15:39:06 +12:00
committed by GitHub
parent 16ef5a9377
commit 35de36d690
6 changed files with 154 additions and 16 deletions
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esphome/components/modbus_controller/modbus_controller.h
+15
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@@ -258,6 +258,7 @@ class SensorItem {
class ServerRegister {
using ReadLambda = std::function<int64_t()>;
using WriteLambda = std::function<bool(int64_t value)>;
public:
ServerRegister(uint16_t address, SensorValueType value_type, uint8_t register_count) {
@@ -277,6 +278,17 @@ class ServerRegister {
};
}
template<typename T>
void set_write_lambda(const std::function<bool(uint16_t address, const T v)> &&user_write_lambda) {
this->write_lambda = [this, user_write_lambda](int64_t number) {
if constexpr (std::is_same_v<T, float>) {
float float_value = bit_cast<float>(static_cast<uint32_t>(number));
return user_write_lambda(this->address, float_value);
}
return user_write_lambda(this->address, static_cast<T>(number));
};
}
// Formats a raw value into a string representation based on the value type for debugging
std::string format_value(int64_t value) const {
switch (this->value_type) {
@@ -304,6 +316,7 @@ class ServerRegister {
SensorValueType value_type{SensorValueType::RAW};
uint8_t register_count{0};
ReadLambda read_lambda;
WriteLambda write_lambda;
};
// ModbusController::create_register_ranges_ tries to optimize register range
@@ -485,6 +498,8 @@ class ModbusController : public PollingComponent, public modbus::ModbusDevice {
void on_modbus_error(uint8_t function_code, uint8_t exception_code) override;
/// called when a modbus request (function code 0x03 or 0x04) was parsed without errors
void on_modbus_read_registers(uint8_t function_code, uint16_t start_address, uint16_t number_of_registers) final;
/// called when a modbus request (function code 0x06 or 0x10) was parsed without errors
void on_modbus_write_registers(uint8_t function_code, const std::vector<uint8_t> &data) final;
/// default delegate called by process_modbus_data when a response has retrieved from the incoming queue
void on_register_data(ModbusRegisterType register_type, uint16_t start_address, const std::vector<uint8_t> &data);
/// default delegate called by process_modbus_data when a response for a write response has retrieved from the