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Tasmota/tasmota/xsns_69_opentherm.ino

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/*
xsns_69_opentherm.ino - OpenTherm protocol support for Tasmota
Copyright (C) 2021 Yuriy Sannikov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_OPENTHERM
#define XSNS_69 69
#include <OpenTherm.h>
// Hot water and boiler parameter ranges
#define OT_HOT_WATER_MIN 23
#define OT_HOT_WATER_MAX 55
#define OT_BOILER_MIN 40
#define OT_BOILER_MAX 85
#define OT_HOT_WATER_DEFAULT 36;
#define OT_BOILER_DEFAULT 85;
// Seconds before OT will make an attempt to connect to the boiler after connection error
#define SNS_OT_DISCONNECT_COOLDOWN_SECONDS 4
// Number of consecutive timeouts which are accepted before entering disconnect state
#define SNS_OT_MAX_TIMEOUTS_BEFORE_DISCONNECT 3
// Count of the OpenThermSettingsFlags
#define OT_FLAGS_COUNT 6
enum OpenThermSettingsFlags
{
// If set, central heating on/off state follows diagnostic indication bit(6), however
// EnableCentralHeating flag has a priority over it
EnableCentralHeatingOnDiagnostics = 0x01,
// If set, DHW is on after restart.
EnableHotWater = 0x02,
// If set, keep CH always on after restart. If off, follows the EnableCentralHeatingOnDiagnostics rule
EnableCentralHeating = 0x04,
EnableCooling = 0x08,
EnableTemperatureCompensation = 0x10,
EnableCentralHeating2 = 0x20,
};
enum OpenThermConnectionStatus
{
OTC_NONE, // OT not initialized
OTC_DISCONNECTED, // OT communication timed out
OTC_CONNECTING, // Connecting after start or from DISCONNECTED state
OTC_HANDSHAKE, // Wait for the handshake response
OTC_READY, // Last Known Good response state is SUCCESS and no requests are in flight
OTC_INFLIGHT // Request sent, waiting from the response
};
OpenThermConnectionStatus sns_ot_connection_status = OpenThermConnectionStatus::OTC_NONE;
uint8_t sns_ot_disconnect_cooldown = 0;
uint8_t sns_ot_timeout_before_disconnect = 0;
OpenTherm *sns_ot_master = NULL;
// Has valid values if connection status is READY or INFLIGHT
typedef struct OT_BOILER_STATUS_T
{
// Boiler fault code
uint8_t m_fault_code;
// Boiler OEM fault code
uint8_t m_oem_fault_code;
// Boilder OEM Diagnostics code
uint16_t m_oem_diag_code;
// OpenTherm ID(3) response.
uint8_t m_slave_flags;
// OpenTherm ID(1) codes. Should be used to display state
unsigned long m_slave_raw_status;
// Desired boiler states
bool m_enableCentralHeating;
bool m_enableHotWater;
bool m_enableCooling;
bool m_enableOutsideTemperatureCompensation;
bool m_enableCentralHeating2;
// Some boilers has an input for the heat request. When short, heat is requested
// OT ID(0) bit 6 may indicate state of the Heat Request input
// By enabling this bit we will set m_enableCentralHeating to true when OT ID(0) bit 6 is set.
// This enables to use external mechanical thermostat to enable heating.
// Some of the use cases might be setting an emergency temperature to prevent freezing
// in case of the software thermostat failure.
bool m_useDiagnosticIndicationAsHeatRequest;
// Hot Water temperature
float m_hotWaterSetpoint_read;
// Flame Modulation
float m_flame_modulation_read;
// Boiler Temperature
float m_boiler_temperature_read;
// Boiler desired values
float m_boilerSetpoint;
float m_hotWaterSetpoint;
} OT_BOILER_STATUS;
OT_BOILER_STATUS sns_ot_boiler_status;
const char *sns_opentherm_connection_stat_to_str(int status)
{
switch (status)
{
case OpenThermConnectionStatus::OTC_NONE:
return "NONE";
case OpenThermConnectionStatus::OTC_DISCONNECTED:
return "FAULT";
case OpenThermConnectionStatus::OTC_CONNECTING:
return "CONNECTING";
case OpenThermConnectionStatus::OTC_HANDSHAKE:
return "HANDSHAKE";
case OpenThermConnectionStatus::OTC_READY:
return "READY";
case OpenThermConnectionStatus::OTC_INFLIGHT:
return "BUSY";
default:
return "UNKNOWN";
}
}
void sns_opentherm_init_boiler_status()
{
memset(&sns_ot_boiler_status, 0, sizeof(OT_BOILER_STATUS));
// Settings
sns_ot_boiler_status.m_useDiagnosticIndicationAsHeatRequest = Settings.ot_flags & (uint8_t)OpenThermSettingsFlags::EnableCentralHeatingOnDiagnostics;
sns_ot_boiler_status.m_enableHotWater = Settings.ot_flags & (uint8_t)OpenThermSettingsFlags::EnableHotWater;
sns_ot_boiler_status.m_enableCentralHeating = Settings.ot_flags & (uint8_t)OpenThermSettingsFlags::EnableCentralHeating;
sns_ot_boiler_status.m_enableCooling = Settings.ot_flags & (uint8_t)OpenThermSettingsFlags::EnableCooling;
sns_ot_boiler_status.m_enableOutsideTemperatureCompensation = Settings.ot_flags & (uint8_t)OpenThermSettingsFlags::EnableTemperatureCompensation;
sns_ot_boiler_status.m_enableCentralHeating2 = Settings.ot_flags & (uint8_t)OpenThermSettingsFlags::EnableCentralHeating2;
sns_ot_boiler_status.m_boilerSetpoint = (float)Settings.ot_boiler_setpoint;
sns_ot_boiler_status.m_hotWaterSetpoint = (float)Settings.ot_hot_water_setpoint;
sns_ot_boiler_status.m_fault_code = 0;
sns_ot_boiler_status.m_oem_fault_code = 0;
sns_ot_boiler_status.m_oem_diag_code = 0;
sns_ot_boiler_status.m_hotWaterSetpoint_read = 0;
sns_ot_boiler_status.m_flame_modulation_read = 0;
sns_ot_boiler_status.m_boiler_temperature_read = 0;
}
void ICACHE_RAM_ATTR sns_opentherm_handleInterrupt()
{
sns_ot_master->handleInterrupt();
}
void sns_opentherm_processResponseCallback(unsigned long response, int st)
{
OpenThermResponseStatus status = (OpenThermResponseStatus)st;
AddLog_P(LOG_LEVEL_DEBUG_MORE,
PSTR("[OTH]: Processing response. Status=%s, Response=0x%lX"),
sns_ot_master->statusToString(status), response);
if (sns_ot_connection_status == OpenThermConnectionStatus::OTC_HANDSHAKE)
{
return sns_ot_process_handshake(response, st);
}
switch (status)
{
case OpenThermResponseStatus::SUCCESS:
if (sns_ot_master->isValidResponse(response))
{
sns_opentherm_process_success_response(&sns_ot_boiler_status, response);
}
sns_ot_connection_status = OpenThermConnectionStatus::OTC_READY;
sns_ot_timeout_before_disconnect = SNS_OT_MAX_TIMEOUTS_BEFORE_DISCONNECT;
break;
case OpenThermResponseStatus::INVALID:
sns_opentherm_check_retry_request();
sns_ot_connection_status = OpenThermConnectionStatus::OTC_READY;
sns_ot_timeout_before_disconnect = SNS_OT_MAX_TIMEOUTS_BEFORE_DISCONNECT;
break;
// Timeout may indicate not valid/supported command or connection error
// In this case we do reconnect.
// If this command will timeout multiple times, it will be excluded from the rotation later on
// after couple of failed attempts. See sns_opentherm_check_retry_request logic
case OpenThermResponseStatus::TIMEOUT:
sns_opentherm_check_retry_request();
if (--sns_ot_timeout_before_disconnect == 0)
{
sns_ot_connection_status = OpenThermConnectionStatus::OTC_DISCONNECTED;
}
else
{
sns_ot_connection_status = OpenThermConnectionStatus::OTC_READY;
}
break;
}
}
bool sns_opentherm_Init()
{
if (PinUsed(GPIO_BOILER_OT_RX) && PinUsed(GPIO_BOILER_OT_TX))
{
sns_ot_master = new OpenTherm(Pin(GPIO_BOILER_OT_RX), Pin(GPIO_BOILER_OT_TX));
sns_ot_master->begin(sns_opentherm_handleInterrupt, sns_opentherm_processResponseCallback);
sns_ot_connection_status = OpenThermConnectionStatus::OTC_CONNECTING;
sns_opentherm_init_boiler_status();
return true;
}
return false;
// !warning, sns_opentherm settings are not ready at this point
}
void sns_opentherm_stat(bool json)
{
if (!sns_ot_master)
{
return;
}
const char *statusStr = sns_opentherm_connection_stat_to_str(sns_ot_connection_status);
if (json)
{
ResponseAppend_P(PSTR(",\"OPENTHERM\":{"));
ResponseAppend_P(PSTR("\"conn\":\"%s\","), statusStr);
ResponseAppend_P(PSTR("\"settings\":%d,"), Settings.ot_flags);
sns_opentherm_dump_telemetry();
ResponseJsonEnd();
#ifdef USE_WEBSERVER
}
else
{
WSContentSend_P(PSTR("{s}OpenTherm status{m}%s (0x%X){e}"), statusStr, (int)sns_ot_boiler_status.m_slave_flags);
if (sns_ot_connection_status < OpenThermConnectionStatus::OTC_READY)
{
return;
}
WSContentSend_P(PSTR("{s}Std/OEM Fault Codes{m}%d / %d{e}"),
(int)sns_ot_boiler_status.m_fault_code,
(int)sns_ot_boiler_status.m_oem_fault_code);
WSContentSend_P(PSTR("{s}OEM Diagnostic Code{m}%d{e}"),
(int)sns_ot_boiler_status.m_oem_diag_code);
WSContentSend_P(PSTR("{s}Hot Water Setpoint{m}%d{e}"),
(int)sns_ot_boiler_status.m_hotWaterSetpoint_read);
WSContentSend_P(PSTR("{s}Flame Modulation{m}%d{e}"),
(int)sns_ot_boiler_status.m_flame_modulation_read);
WSContentSend_P(PSTR("{s}Boiler Temp/Setpnt{m}%d / %d{e}"),
(int)sns_ot_boiler_status.m_boiler_temperature_read,
(int)sns_ot_boiler_status.m_boilerSetpoint);
if (OpenTherm::isCentralHeatingActive(sns_ot_boiler_status.m_slave_raw_status))
{
WSContentSend_P(PSTR("{s}Central Heating is ACTIVE{m}{e}"));
}
if (sns_ot_boiler_status.m_enableHotWater)
{
WSContentSend_P(PSTR("{s}Hot Water is Enabled{m}{e}"));
}
if (OpenTherm::isHotWaterActive(sns_ot_boiler_status.m_slave_raw_status))
{
WSContentSend_P(PSTR("{s}Hot Water is ACTIVE{m}{e}"));
}
if (OpenTherm::isFlameOn(sns_ot_boiler_status.m_slave_raw_status))
{
WSContentSend_P(PSTR("{s}Flame is ACTIVE{m}{e}"));
}
if (sns_ot_boiler_status.m_enableCooling)
{
WSContentSend_P(PSTR("{s}Cooling is Enabled{m}{e}"));
}
if (OpenTherm::isCoolingActive(sns_ot_boiler_status.m_slave_raw_status))
{
WSContentSend_P(PSTR("{s}Cooling is ACTIVE{m}{e}"));
}
if (OpenTherm::isDiagnostic(sns_ot_boiler_status.m_slave_raw_status))
{
WSContentSend_P(PSTR("{s}Diagnostic Indication{m}{e}"));
}
#endif // USE_WEBSERVER
}
}
void sns_ot_start_handshake()
{
if (!sns_ot_master)
{
return;
}
AddLog_P(LOG_LEVEL_DEBUG, PSTR("[OTH]: perform handshake"));
sns_ot_master->sendRequestAync(
OpenTherm::buildRequest(OpenThermMessageType::READ_DATA, OpenThermMessageID::SConfigSMemberIDcode, 0));
sns_ot_connection_status = OpenThermConnectionStatus::OTC_HANDSHAKE;
}
void sns_ot_process_handshake(unsigned long response, int st)
{
OpenThermResponseStatus status = (OpenThermResponseStatus)st;
if (status != OpenThermResponseStatus::SUCCESS || !sns_ot_master->isValidResponse(response))
{
AddLog_P(LOG_LEVEL_ERROR,
PSTR("[OTH]: getSlaveConfiguration failed. Status=%s"),
sns_ot_master->statusToString(status));
sns_ot_connection_status = OpenThermConnectionStatus::OTC_DISCONNECTED;
return;
}
AddLog_P(LOG_LEVEL_DEBUG, PSTR("[OTH]: getLastResponseStatus SUCCESS. Slave Cfg: %lX"), response);
sns_ot_boiler_status.m_slave_flags = (response & 0xFF00) >> 8;
sns_ot_connection_status = OpenThermConnectionStatus::OTC_READY;
}
void sns_opentherm_CheckSettings(void)
{
bool settingsValid = true;
settingsValid &= Settings.ot_hot_water_setpoint >= OT_HOT_WATER_MIN;
settingsValid &= Settings.ot_hot_water_setpoint <= OT_HOT_WATER_MAX;
settingsValid &= Settings.ot_boiler_setpoint >= OT_BOILER_MIN;
settingsValid &= Settings.ot_boiler_setpoint <= OT_BOILER_MAX;
if (!settingsValid)
{
Settings.ot_hot_water_setpoint = OT_HOT_WATER_DEFAULT;
Settings.ot_boiler_setpoint = OT_BOILER_DEFAULT;
Settings.ot_flags =
OpenThermSettingsFlags::EnableCentralHeatingOnDiagnostics |
OpenThermSettingsFlags::EnableHotWater;
}
}
/*********************************************************************************************\
* Command Processing
\*********************************************************************************************/
const char *sns_opentherm_flag_text(uint8_t mode)
{
switch ((OpenThermSettingsFlags)mode)
{
case OpenThermSettingsFlags::EnableCentralHeatingOnDiagnostics:
return "CHOD";
case OpenThermSettingsFlags::EnableHotWater:
return "DHW";
case OpenThermSettingsFlags::EnableCentralHeating:
return "CH";
case OpenThermSettingsFlags::EnableCooling:
return "COOL";
case OpenThermSettingsFlags::EnableTemperatureCompensation:
return "OTC";
case OpenThermSettingsFlags::EnableCentralHeating2:
return "CH2";
default:
return "?";
}
}
uint8_t sns_opentherm_parse_flag(char *flag)
{
if (!strncmp(flag, "CHOD", 4))
{
return OpenThermSettingsFlags::EnableCentralHeatingOnDiagnostics;
}
else if (!strncmp(flag, "COOL", 4))
{
return OpenThermSettingsFlags::EnableCooling;
}
else if (!strncmp(flag, "DHW", 3))
{
return OpenThermSettingsFlags::EnableHotWater;
}
else if (!strncmp(flag, "OTC", 3))
{
return OpenThermSettingsFlags::EnableTemperatureCompensation;
}
else if (!strncmp(flag, "CH2", 3))
{
return OpenThermSettingsFlags::EnableCentralHeating2;
}
else if (!strncmp(flag, "CH", 2))
{
return OpenThermSettingsFlags::EnableCentralHeating;
}
return 0;
}
uint8_t sns_opentherm_read_flags(char *data, uint32_t len)
{
uint8_t tokens = 1;
for (int i = 0; i < len; ++i)
{
if (data[i] == ',')
{
++tokens;
}
}
uint8_t result = 0;
char sub_string[XdrvMailbox.data_len + 1];
for (int i = 1; i <= tokens; ++i)
{
char *flag = subStr(sub_string, data, ",", i);
if (!flag)
{
break;
}
result |= sns_opentherm_parse_flag(flag);
}
return result;
}
#define D_PRFX_OTHERM "ot_"
// set the boiler temperature (CH). Sutable for the PID app.
// After restart will use the defaults from the settings
#define D_CMND_OTHERM_BOILER_SETPOINT "tboiler"
// set hot water (DHW) temperature. Do not write it in the flash memory.
// suitable for the temporary changes
#define D_CMND_OTHERM_DHW_SETPOINT "twater"
// This command will save CH and DHW setpoints into the settings. Those values will be used after system restart
// The reason to separate set and save is to reduce flash memory write count, especially if boiler temperature is controlled
// by the PID thermostat
#define D_CMND_OTHERM_SAVE_SETTINGS "save_setpoints"
// Get or set flags
// EnableCentralHeatingOnDiagnostics -> CHOD
// EnableHotWater -> DHW
// EnableCentralHeating -> CH
// EnableCooling -> COOL
// EnableTemperatureCompensation -> OTC
// EnableCentralHeating2 -> CH2
#define D_CMND_OTHERM_FLAGS "flags"
// Get/Set boiler status m_enableCentralHeating value. It's equivalent of the EnableCentralHeating settings
// flag value, however, this command does not update the settings.
// Usefull to buld automations
// Please note, if you set it to "0" and EnableCentralHeatingOnDiagnostics is set
// boiler will follow the Diagnostics bit and won't turn CH off. When Diagnostics bit cleared,
// and "ot_ch" is "1", boiler will keep heating
#define D_CMND_SET_CENTRAL_HEATING_ENABLED "ch"
const char kOpenThermCommands[] PROGMEM = D_PRFX_OTHERM "|" D_CMND_OTHERM_BOILER_SETPOINT "|" D_CMND_OTHERM_DHW_SETPOINT
"|" D_CMND_OTHERM_SAVE_SETTINGS "|" D_CMND_OTHERM_FLAGS "|" D_CMND_SET_CENTRAL_HEATING_ENABLED;
void (*const OpenThermCommands[])(void) PROGMEM = {
&sns_opentherm_boiler_setpoint_cmd,
&sns_opentherm_hot_water_setpoint_cmd,
&sns_opentherm_save_settings_cmd,
&sns_opentherm_flags_cmd,
&sns_opentherm_set_central_heating_cmd};
void sns_opentherm_cmd(void) { }
void sns_opentherm_boiler_setpoint_cmd(void)
{
bool query = strlen(XdrvMailbox.data) == 0;
if (!query)
{
sns_ot_boiler_status.m_boilerSetpoint = atof(XdrvMailbox.data);
}
ResponseCmndFloat(sns_ot_boiler_status.m_boilerSetpoint, Settings.flag2.temperature_resolution);
}
void sns_opentherm_hot_water_setpoint_cmd(void)
{
bool query = strlen(XdrvMailbox.data) == 0;
if (!query)
{
sns_ot_boiler_status.m_hotWaterSetpoint = atof(XdrvMailbox.data);
}
ResponseCmndFloat(sns_ot_boiler_status.m_hotWaterSetpoint, Settings.flag2.temperature_resolution);
}
void sns_opentherm_save_settings_cmd(void)
{
Settings.ot_hot_water_setpoint = (uint8_t)sns_ot_boiler_status.m_hotWaterSetpoint;
Settings.ot_boiler_setpoint = (uint8_t)sns_ot_boiler_status.m_boilerSetpoint;
ResponseCmndDone();
}
void sns_opentherm_flags_cmd(void)
{
bool query = strlen(XdrvMailbox.data) == 0;
if (!query)
{
// Set flags value
Settings.ot_flags = sns_opentherm_read_flags(XdrvMailbox.data, XdrvMailbox.data_len);
// Reset boiler status to apply settings
sns_opentherm_init_boiler_status();
}
bool addComma = false;
TasmotaGlobal.mqtt_data[0] = 0;
for (int pos = 0; pos < OT_FLAGS_COUNT; ++pos)
{
int mask = 1 << pos;
int mode = Settings.ot_flags & (uint8_t)mask;
if (mode > 0)
{
if (addComma)
{
snprintf_P(TasmotaGlobal.mqtt_data, sizeof(TasmotaGlobal.mqtt_data), PSTR("%s,"), TasmotaGlobal.mqtt_data);
}
snprintf_P(TasmotaGlobal.mqtt_data, sizeof(TasmotaGlobal.mqtt_data), PSTR("%s%s"), TasmotaGlobal.mqtt_data, sns_opentherm_flag_text(mode));
addComma = true;
}
}
}
void sns_opentherm_set_central_heating_cmd(void)
{
bool query = strlen(XdrvMailbox.data) == 0;
if (!query)
{
sns_ot_boiler_status.m_enableCentralHeating = atoi(XdrvMailbox.data);
}
ResponseCmndNumber(sns_ot_boiler_status.m_enableCentralHeating ? 1 : 0);
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns69(uint8_t function)
{
bool result = false;
if (FUNC_INIT == function)
{
if (sns_opentherm_Init())
{
sns_opentherm_CheckSettings();
}
}
if (!sns_ot_master)
{
return result;
}
switch (function)
{
case FUNC_LOOP:
sns_ot_master->process();
break;
case FUNC_EVERY_100_MSECOND:
if (sns_ot_connection_status == OpenThermConnectionStatus::OTC_READY && sns_ot_master->isReady())
{
unsigned long request = sns_opentherm_get_next_request(&sns_ot_boiler_status);
if (-1 != request)
{
sns_ot_master->sendRequestAync(request);
sns_ot_connection_status = OpenThermConnectionStatus::OTC_INFLIGHT;
}
}
break;
case FUNC_EVERY_SECOND:
if (sns_ot_connection_status == OpenThermConnectionStatus::OTC_DISCONNECTED)
{
// If disconnected, wait for the SNS_OT_DISCONNECT_COOLDOWN_SECONDS before the handshake
if (sns_ot_disconnect_cooldown == 0)
{
sns_ot_disconnect_cooldown = SNS_OT_DISCONNECT_COOLDOWN_SECONDS;
}
else if (--sns_ot_disconnect_cooldown == 0)
{
sns_ot_connection_status = OpenThermConnectionStatus::OTC_CONNECTING;
}
}
else if (sns_ot_connection_status == OpenThermConnectionStatus::OTC_CONNECTING)
{
sns_ot_start_handshake();
}
break;
case FUNC_COMMAND:
result = DecodeCommand(kOpenThermCommands, OpenThermCommands);
break;
case FUNC_JSON_APPEND:
sns_opentherm_stat(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
sns_opentherm_stat(0);
break;
#endif // USE_WEBSERVER
}
return result;
}
#endif // USE_OPENTHERM
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