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Fork of the espurna firmware for `mhsw` switches
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mhsw-espurna/code/espurna/rfbridge.ino

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/*
ITEAD RF BRIDGE MODULE
Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
*/
#ifdef ITEAD_SONOFF_RFBRIDGE
// -----------------------------------------------------------------------------
// DEFINITIONS
// -----------------------------------------------------------------------------
#define RF_MESSAGE_SIZE 9
#define RF_CODE_START 0xAA
#define RF_CODE_ACK 0xA0
#define RF_CODE_LEARN 0xA1
#define RF_CODE_LEARN_KO 0xA2
#define RF_CODE_LEARN_OK 0xA3
#define RF_CODE_RFIN 0xA4
#define RF_CODE_RFOUT 0xA5
#define RF_CODE_STOP 0x55
// -----------------------------------------------------------------------------
// GLOBALS TO THE MODULE
// -----------------------------------------------------------------------------
unsigned char _uartbuf[RF_MESSAGE_SIZE+3] = {0};
unsigned char _uartpos = 0;
unsigned char _learnId = 0;
bool _learnStatus = true;
bool _rfbin = false;
// -----------------------------------------------------------------------------
// PRIVATES
// -----------------------------------------------------------------------------
void _rfbAck() {
DEBUG_MSG_P(PSTR("[RFBRIDGE] Sending ACK\n"));
Serial.println();
Serial.write(RF_CODE_START);
Serial.write(RF_CODE_ACK);
Serial.write(RF_CODE_STOP);
Serial.flush();
Serial.println();
}
void _rfbLearn() {
DEBUG_MSG_P(PSTR("[RFBRIDGE] Sending LEARN\n"));
Serial.println();
Serial.write(RF_CODE_START);
Serial.write(RF_CODE_LEARN);
Serial.write(RF_CODE_STOP);
Serial.flush();
Serial.println();
#if WEB_SUPPORT
char buffer[100];
snprintf_P(buffer, sizeof(buffer), PSTR("{\"action\": \"rfbLearn\", \"data\":{\"id\": %d, \"status\": %d}}"), _learnId, _learnStatus ? 1 : 0);
wsSend(buffer);
#endif
}
void _rfbSend(byte * message) {
Serial.println();
Serial.write(RF_CODE_START);
Serial.write(RF_CODE_RFOUT);
for (unsigned char j=0; j<RF_MESSAGE_SIZE; j++) {
Serial.write(message[j]);
}
Serial.write(RF_CODE_STOP);
Serial.flush();
Serial.println();
}
void _rfbSend(byte * message, int times) {
char buffer[RF_MESSAGE_SIZE];
_rfbToChar(message, buffer);
DEBUG_MSG_P(PSTR("[RFBRIDGE] Sending MESSAGE '%s' %d time(s)\n"), buffer, times);
for (int i=0; i<times; i++) {
if (i>0) {
unsigned long start = millis();
while (millis() - start < RF_SEND_DELAY) delay(1);
}
_rfbSend(message);
}
}
void _rfbDecode() {
byte action = _uartbuf[0];
char buffer[RF_MESSAGE_SIZE * 2 + 1] = {0};
DEBUG_MSG_P(PSTR("[RFBRIDGE] Action 0x%02X\n"), action);
if (action == RF_CODE_LEARN_KO) {
_rfbAck();
DEBUG_MSG_P(PSTR("[RFBRIDGE] Learn timeout\n"));
#if WEB_SUPPORT
wsSend_P(PSTR("{\"action\": \"rfbTimeout\"}"));
#endif
}
if (action == RF_CODE_LEARN_OK || action == RF_CODE_RFIN) {
_rfbToChar(&_uartbuf[1], buffer);
mqttSend(MQTT_TOPIC_RFIN, buffer);
_rfbAck();
}
if (action == RF_CODE_LEARN_OK) {
DEBUG_MSG_P(PSTR("[RFBRIDGE] Learn success\n"));
rfbStore(_learnId, _learnStatus, buffer);
// Websocket update
#if WEB_SUPPORT
char wsb[100];
snprintf_P(wsb, sizeof(wsb), PSTR("{\"rfb\":[{\"id\": %d, \"status\": %d, \"data\": \"%s\"}]}"), _learnId, _learnStatus ? 1 : 0, buffer);
wsSend(wsb);
#endif
}
if (action == RF_CODE_RFIN) {
DEBUG_MSG_P(PSTR("[RFBRIDGE] Forward message '%s'\n"), buffer);
// Look for the code
unsigned char id, status;
bool found = false;
for (id=0; id<relayCount(); id++) {
for (status=0; status<2; status++) {
String code = rfbRetrieve(id, status == 1);
if (code.length()) {
if (code.endsWith(&buffer[12])) {
found = true;
break;
}
}
}
if (found) break;
}
if (found) {
_rfbin = true;
relayStatus(id, status == 1);
}
}
}
void _rfbReceive() {
static bool receiving = false;
while (Serial.available()) {
yield();
byte c = Serial.read();
//DEBUG_MSG_P(PSTR("[RFBRIDGE] Received 0x%02X\n"), c);
if (receiving) {
if (c == RF_CODE_STOP) {
_rfbDecode();
receiving = false;
} else {
_uartbuf[_uartpos++] = c;
}
} else if (c == RF_CODE_START) {
_uartpos = 0;
receiving = true;
}
}
}
bool _rfbCompare(const char * code1, const char * code2) {
return strcmp(&code1[12], &code2[12]) == 0;
}
bool _rfbSameOnOff(unsigned char id) {
return _rfbCompare(rfbRetrieve(id, true).c_str(), rfbRetrieve(id, false).c_str());
}
/*
From an hexa char array ("A220EE...") to a byte array (half the size)
*/
bool _rfbToArray(const char * in, byte * out) {
if (strlen(in) != RF_MESSAGE_SIZE * 2) return false;
char tmp[3] = {0};
for (unsigned char p = 0; p<RF_MESSAGE_SIZE; p++) {
memcpy(tmp, &in[p*2], 2);
out[p] = strtol(tmp, NULL, 16);
}
return true;
}
/*
From a byte array to an hexa char array ("A220EE...", double the size)
*/
bool _rfbToChar(byte * in, char * out) {
for (unsigned char p = 0; p<RF_MESSAGE_SIZE; p++) {
sprintf_P(&out[p*2], PSTR("%02X"), in[p]);
}
return true;
}
void _rfbMqttCallback(unsigned int type, const char * topic, const char * payload) {
if (type == MQTT_CONNECT_EVENT) {
char buffer[strlen(MQTT_TOPIC_RFLEARN) + 3];
snprintf_P(buffer, sizeof(buffer), PSTR("%s/+"), MQTT_TOPIC_RFLEARN);
mqttSubscribe(buffer);
mqttSubscribe(MQTT_TOPIC_RFOUT);
}
if (type == MQTT_MESSAGE_EVENT) {
// Match topic
String t = mqttSubtopic((char *) topic);
// Check if should go into learn mode
if (t.startsWith(MQTT_TOPIC_RFLEARN)) {
_learnId = t.substring(strlen(MQTT_TOPIC_RFLEARN)+1).toInt();
if (_learnId >= relayCount()) {
DEBUG_MSG_P(PSTR("[RFBRIDGE] Wrong learnID (%d)\n"), _learnId);
return;
}
_learnStatus = (char)payload[0] != '0';
_rfbLearn();
}
if (t.equals(MQTT_TOPIC_RFOUT)) {
// The payload may be a code in HEX format ([0-9A-Z]{18}) or
// the code comma the number of times to transmit it.
byte message[RF_MESSAGE_SIZE];
char * tok = strtok((char *) payload, ",");
if (_rfbToArray(tok, message)) {
tok = strtok(NULL, ",");
byte times = (tok != NULL) ? atoi(tok) : 1;
_rfbSend(message, times);
}
}
}
}
// -----------------------------------------------------------------------------
// PUBLIC
// -----------------------------------------------------------------------------
void rfbStore(unsigned char id, bool status, const char * code) {
DEBUG_MSG_P(PSTR("[RFBRIDGE] Storing %d-%s => '%s'\n"), id, status ? "ON" : "OFF", code);
char key[8] = {0};
snprintf_P(key, sizeof(key), PSTR("rfb%d%s"), id, status ? "on" : "off");
setSetting(key, code);
}
String rfbRetrieve(unsigned char id, bool status) {
char key[8] = {0};
snprintf_P(key, sizeof(key), PSTR("rfb%d%s"), id, status ? "on" : "off");
return getSetting(key);
}
void rfbStatus(unsigned char id, bool status) {
String value = rfbRetrieve(id, status);
if (value.length() > 0) {
bool same = _rfbSameOnOff(id);
byte message[RF_MESSAGE_SIZE];
_rfbToArray(value.c_str(), message);
unsigned char times = RF_SEND_TIMES;
if (same) times = _rfbin ? 0 : 1;
_rfbSend(message, times);
}
}
void rfbLearn(unsigned char id, bool status) {
_learnId = id;
_learnStatus = status;
_rfbLearn();
}
void rfbForget(unsigned char id, bool status) {
char key[8] = {0};
snprintf_P(key, sizeof(key), PSTR("rfb%d%s"), id, status ? "on" : "off");
delSetting(key);
// Websocket update
#if WEB_SUPPORT
char wsb[100];
snprintf_P(wsb, sizeof(wsb), PSTR("{\"rfb\":[{\"id\": %d, \"status\": %d, \"data\": \"\"}]}"), id, status ? 1 : 0);
wsSend(wsb);
#endif
}
// -----------------------------------------------------------------------------
// SETUP & LOOP
// -----------------------------------------------------------------------------
void rfbSetup() {
mqttRegister(_rfbMqttCallback);
}
void rfbLoop() {
_rfbReceive();
}
#endif