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Tasmota/tasmota/tasmota_xdrv_driver/xdrv_08_serial_bridge.ino

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/*
xdrv_08_serial_bridge.ino - serial bridge support for Tasmota
Copyright (C) 2021 Theo Arends and Dániel Zoltán Tolnai
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_SERIAL_BRIDGE
/*********************************************************************************************\
* Serial Bridge using Software Serial library (TasmotaSerial)
\*********************************************************************************************/
#define XDRV_08 8
#define HARDWARE_FALLBACK 2
#define USE_SERIAL_BRIDGE_TEE
#ifdef ESP8266
const uint16_t SERIAL_BRIDGE_BUFFER_SIZE = MIN_INPUT_BUFFER_SIZE;
#else
const uint16_t SERIAL_BRIDGE_BUFFER_SIZE = INPUT_BUFFER_SIZE;
#endif
const char kSerialBridgeCommands[] PROGMEM = "|" // No prefix
D_CMND_SSERIALSEND "|" D_CMND_SBAUDRATE "|" D_CMND_SSERIALCONFIG;
void (* const SerialBridgeCommand[])(void) PROGMEM = {
&CmndSSerialSend, &CmndSBaudrate, &CmndSSerialConfig };
#include <TasmotaSerial.h>
TasmotaSerial *SerialBridgeSerial = nullptr;
unsigned long serial_bridge_polling_window = 0;
char *serial_bridge_buffer = nullptr;
int serial_bridge_in_byte_counter = 0;
bool serial_bridge_raw = false;
/********************************************************************************************/
bool SetSSerialBegin(void) {
return SerialBridgeSerial->begin(Settings->sbaudrate * 300, ConvertSerialConfig(Settings->sserial_config)); // Reinitialize serial port with new baud rate
}
void SetSSerialConfig(uint32_t serial_config) {
if (serial_config > TS_SERIAL_8O2) {
serial_config = TS_SERIAL_8N1;
}
if (serial_config != Settings->sserial_config) {
Settings->sserial_config = serial_config;
SetSSerialBegin();
}
}
void SerialBridgePrintf(PGM_P formatP, ...) {
#ifdef USE_SERIAL_BRIDGE_TEE
if (Settings->sbflag1.serbridge_console && serial_bridge_buffer) {
va_list arg;
va_start(arg, formatP);
char* data = ext_vsnprintf_malloc_P(formatP, arg);
va_end(arg);
if (data == nullptr) { return; }
SerialBridgeSerial->printf(data);
free(data);
}
#endif // USE_SERIAL_BRIDGE_TEE
}
/********************************************************************************************/
void SerialBridgeInput(void) {
while (SerialBridgeSerial->available()) {
yield();
uint8_t serial_in_byte = SerialBridgeSerial->read();
#ifdef USE_SERIAL_BRIDGE_TEE
if (Settings->sbflag1.serbridge_console) {
static bool serial_bridge_overrun = false;
if (isprint(serial_in_byte)) { // Any char between 32 and 127
if (serial_bridge_in_byte_counter < SERIAL_BRIDGE_BUFFER_SIZE -1) { // Add char to string if it still fits
serial_bridge_buffer[serial_bridge_in_byte_counter++] = serial_in_byte;
} else {
serial_bridge_overrun = true; // Signal overrun but continue reading input to flush until '\n' (EOL)
}
}
else if (serial_in_byte == '\n') {
serial_bridge_buffer[serial_bridge_in_byte_counter] = 0; // Serial data completed
TasmotaGlobal.seriallog_level = (Settings->seriallog_level < LOG_LEVEL_INFO) ? (uint8_t)LOG_LEVEL_INFO : Settings->seriallog_level;
if (serial_bridge_overrun) {
AddLog(LOG_LEVEL_INFO, PSTR(D_LOG_COMMAND "SSerial buffer overrun"));
} else {
AddLog(LOG_LEVEL_INFO, PSTR(D_LOG_COMMAND "%s"), serial_bridge_buffer);
ExecuteCommand(serial_bridge_buffer, SRC_SSERIAL);
}
serial_bridge_in_byte_counter = 0;
serial_bridge_overrun = false;
SerialBridgeSerial->flush();
return;
}
} else {
#endif // USE_SERIAL_BRIDGE_TEE
serial_bridge_raw = (254 == Settings->serial_delimiter);
if ((serial_in_byte > 127) && !serial_bridge_raw) { // Discard binary data above 127 if no raw reception allowed
serial_bridge_in_byte_counter = 0;
SerialBridgeSerial->flush();
return;
}
if (serial_in_byte || serial_bridge_raw) { // Any char between 1 and 127 or any char (0 - 255)
bool in_byte_is_delimiter = // Char is delimiter when...
(((Settings->serial_delimiter < 128) && (serial_in_byte == Settings->serial_delimiter)) || // Any char between 1 and 127 and being delimiter
((Settings->serial_delimiter == 128) && !isprint(serial_in_byte))) && // Any char not between 32 and 127
!serial_bridge_raw; // In raw mode (CMND_SERIALSEND3) there is never a delimiter
if ((serial_bridge_in_byte_counter < SERIAL_BRIDGE_BUFFER_SIZE -1) && // Add char to string if it still fits and ...
!in_byte_is_delimiter) { // Char is not a delimiter
serial_bridge_buffer[serial_bridge_in_byte_counter++] = serial_in_byte;
}
if ((serial_bridge_in_byte_counter >= SERIAL_BRIDGE_BUFFER_SIZE -1) || // Send message when buffer is full or ...
in_byte_is_delimiter) { // Char is delimiter
serial_bridge_polling_window = 0; // Publish now
break;
}
}
serial_bridge_polling_window = millis(); // Wait for more data
#ifdef USE_SERIAL_BRIDGE_TEE
}
#endif // USE_SERIAL_BRIDGE_TEE
}
#ifdef USE_SERIAL_BRIDGE_TEE
if (Settings->sbflag1.serbridge_console) {
return;
}
#endif // USE_SERIAL_BRIDGE_TEE
if (serial_bridge_in_byte_counter && (millis() > (serial_bridge_polling_window + SERIAL_POLLING))) {
serial_bridge_buffer[serial_bridge_in_byte_counter] = 0; // Serial data completed
bool assume_json = (!serial_bridge_raw && (serial_bridge_buffer[0] == '{'));
Response_P(PSTR("{\"" D_JSON_SSERIALRECEIVED "\":"));
if (assume_json) {
ResponseAppend_P(serial_bridge_buffer);
} else {
ResponseAppend_P(PSTR("\""));
if (serial_bridge_raw) {
char hex_char[(serial_bridge_in_byte_counter * 2) + 2];
ResponseAppend_P(ToHex_P((unsigned char*)serial_bridge_buffer, serial_bridge_in_byte_counter, hex_char, sizeof(hex_char)));
} else {
ResponseAppend_P(EscapeJSONString(serial_bridge_buffer).c_str());
}
ResponseAppend_P(PSTR("\""));
}
ResponseJsonEnd();
if (Settings->flag6.mqtt_disable_sserialrec ) { // SetOption147 If it is activated, Tasmota will not publish SSerialReceived MQTT messages, but it will proccess event trigger rules
XdrvRulesProcess(0);
} else {
MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_TELE, PSTR(D_JSON_SSERIALRECEIVED));
}
serial_bridge_in_byte_counter = 0;
}
}
/********************************************************************************************/
void SerialBridgeInit(void) {
if (PinUsed(GPIO_SBR_RX) && PinUsed(GPIO_SBR_TX)) {
SerialBridgeSerial = new TasmotaSerial(Pin(GPIO_SBR_RX), Pin(GPIO_SBR_TX), HARDWARE_FALLBACK);
if (SetSSerialBegin()) {
if (SerialBridgeSerial->hardwareSerial()) {
ClaimSerial();
serial_bridge_buffer = TasmotaGlobal.serial_in_buffer; // Use idle serial buffer to save RAM
} else {
serial_bridge_buffer = (char*)(malloc(SERIAL_BRIDGE_BUFFER_SIZE));
}
SerialBridgeSerial->flush();
SerialBridgePrintf("\r\n");
}
}
}
/*********************************************************************************************\
* Commands
\*********************************************************************************************/
void CmndSSerialSend(void) {
if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= 6)) {
serial_bridge_raw = (XdrvMailbox.index > 3);
Settings->sbflag1.serbridge_console = 0; // Disable console Tee
if (XdrvMailbox.data_len > 0) {
if (1 == XdrvMailbox.index) {
SerialBridgeSerial->write(XdrvMailbox.data, XdrvMailbox.data_len); // "Hello Tiger"
SerialBridgeSerial->write("\n"); // "\n"
}
else if ((2 == XdrvMailbox.index) || (4 == XdrvMailbox.index)) {
SerialBridgeSerial->write(XdrvMailbox.data, XdrvMailbox.data_len); // "Hello Tiger" or "A0"
}
else if (3 == XdrvMailbox.index) { // "Hello\f"
SerialBridgeSerial->write(Unescape(XdrvMailbox.data, &XdrvMailbox.data_len), XdrvMailbox.data_len);
}
else if (5 == XdrvMailbox.index) {
char *p;
char stemp[3];
uint8_t code;
char *codes = RemoveSpace(XdrvMailbox.data);
int size = strlen(XdrvMailbox.data);
while (size > 1) {
strlcpy(stemp, codes, sizeof(stemp));
code = strtol(stemp, &p, 16);
SerialBridgeSerial->write(code); // "AA004566" as hex values
size -= 2;
codes += 2;
}
}
else if (6 == XdrvMailbox.index) {
char *p;
uint8_t code;
char *values = XdrvMailbox.data;
for (char* str = strtok_r(values, ",", &p); str; str = strtok_r(nullptr, ",", &p)) {
code = (uint8_t)atoi(str);
SerialBridgeSerial->write(code); // "72,101,108,108"
}
}
ResponseCmndDone();
}
}
#ifdef USE_SERIAL_BRIDGE_TEE
if (9 == XdrvMailbox.index) {
if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 1)) {
Settings->sbflag1.serbridge_console = XdrvMailbox.payload;
}
ResponseCmndStateText(Settings->sbflag1.serbridge_console);
}
#endif // USE_SERIAL_BRIDGE_TEE
}
void CmndSBaudrate(void) {
if (XdrvMailbox.payload >= 300) {
XdrvMailbox.payload /= 300; // Make it a valid baudrate
Settings->sbaudrate = XdrvMailbox.payload;
SetSSerialBegin();
}
ResponseCmndNumber(Settings->sbaudrate * 300);
}
void CmndSSerialConfig(void) {
// See TasmotaSerialConfig for possible options
// SSerialConfig 0..23 where 3 equals 8N1
// SSerialConfig 8N1
if (XdrvMailbox.data_len > 0) {
if (XdrvMailbox.data_len < 3) { // Use 0..23 as serial config option
if ((XdrvMailbox.payload >= TS_SERIAL_5N1) && (XdrvMailbox.payload <= TS_SERIAL_8O2)) {
SetSSerialConfig(XdrvMailbox.payload);
}
}
else if ((XdrvMailbox.payload >= 5) && (XdrvMailbox.payload <= 8)) {
int8_t serial_config = ParseSerialConfig(XdrvMailbox.data);
if (serial_config >= 0) {
SetSSerialConfig(serial_config);
}
}
}
ResponseCmndChar(GetSerialConfig(Settings->sserial_config).c_str());
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xdrv08(uint8_t function) {
bool result = false;
if (FUNC_PRE_INIT == function) {
SerialBridgeInit();
}
else if (serial_bridge_buffer) {
switch (function) {
case FUNC_LOOP:
SerialBridgeInput();
break;
case FUNC_COMMAND:
result = DecodeCommand(kSerialBridgeCommands, SerialBridgeCommand);
break;
}
}
return result;
}
#endif // USE_SERIAL_BRIDGE
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