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Add support for acting as Modbus server (#4874)

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Co-authored-by: Jeroen van Oort <jeroen.vanoort@webparking.nl>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
Jeroen van Oort
2024-05-22 06:17:32 +02:00
committed by GitHub
parent 76abf2200c
commit 1ca7c2d7dd
7 changed files with 203 additions and 21 deletions
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57
esphome/components/modbus_controller/modbus_controller.cpp
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@@ -7,10 +7,7 @@ namespace modbus_controller {
static const char *const TAG = "modbus_controller";
void ModbusController::setup() {
// Modbus::setup();
this->create_register_ranges_();
}
void ModbusController::setup() { this->create_register_ranges_(); }
/*
To work with the existing modbus class and avoid polling for responses a command queue is used.
@@ -102,6 +99,51 @@ void ModbusController::on_modbus_error(uint8_t function_code, uint8_t exception_
}
}
void ModbusController::on_modbus_read_registers(uint8_t function_code, uint16_t start_address,
uint16_t number_of_registers) {
ESP_LOGD(TAG,
"Received read holding/input registers for device 0x%X. FC: 0x%X. Start address: 0x%X. Number of registers: "
"0x%X.",
this->address_, function_code, start_address, number_of_registers);
std::vector<uint16_t> sixteen_bit_response;
for (uint16_t current_address = start_address; current_address < start_address + number_of_registers;) {
bool found = false;
for (auto *server_register : this->server_registers_) {
if (server_register->address == current_address) {
float value = server_register->read_lambda();
ESP_LOGD(TAG, "Matched register. Address: 0x%02X. Value type: %zu. Register count: %u. Value: %0.1f.",
server_register->address, static_cast<uint8_t>(server_register->value_type),
server_register->register_count, value);
number_to_payload(sixteen_bit_response, value, server_register->value_type);
current_address += server_register->register_count;
found = true;
break;
}
}
if (!found) {
ESP_LOGW(TAG, "Could not match any register to address %02X. Sending exception response.", current_address);
std::vector<uint8_t> error_response;
error_response.push_back(this->address_);
error_response.push_back(0x81);
error_response.push_back(0x02);
this->send_raw(error_response);
return;
}
}
std::vector<uint8_t> response;
for (auto v : sixteen_bit_response) {
auto decoded_value = decode_value(v);
response.push_back(decoded_value[0]);
response.push_back(decoded_value[1]);
}
this->send(function_code, start_address, number_of_registers, response.size(), response.data());
}
SensorSet ModbusController::find_sensors_(ModbusRegisterType register_type, uint16_t start_address) const {
auto reg_it = find_if(begin(register_ranges_), end(register_ranges_), [=](RegisterRange const &r) {
return (r.start_address == start_address && r.register_type == register_type);
@@ -190,7 +232,7 @@ void ModbusController::update() {
// walk through the sensors and determine the register ranges to read
size_t ModbusController::create_register_ranges_() {
register_ranges_.clear();
if (sensorset_.empty()) {
if (this->parent_->role == modbus::ModbusRole::CLIENT && sensorset_.empty()) {
ESP_LOGW(TAG, "No sensors registered");
return 0;
}
@@ -309,6 +351,11 @@ void ModbusController::dump_config() {
ESP_LOGCONFIG(TAG, " Range type=%zu start=0x%X count=%d skip_updates=%d", static_cast<uint8_t>(it.register_type),
it.start_address, it.register_count, it.skip_updates);
}
ESP_LOGCONFIG(TAG, "server registers");
for (auto &r : server_registers_) {
ESP_LOGCONFIG(TAG, " Address=0x%02X value_type=%zu register_count=%u", r->address,
static_cast<uint8_t>(r->value_type), r->register_count);
}
#endif
}