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#include "mqtt.h"
#include "logging.h"
#include "wifi.h"
#include "config.def.h"
#include "relay.h"
#include "config.h"
namespace homekit::mqtt {
static const uint8_t MQTT_CA_FINGERPRINT[] = DEFAULT_MQTT_CA_FINGERPRINT;
static const char MQTT_SERVER[] = DEFAULT_MQTT_SERVER;
static const uint16_t MQTT_PORT = DEFAULT_MQTT_PORT;
static const char MQTT_USERNAME[] = DEFAULT_MQTT_USERNAME;
static const char MQTT_PASSWORD[] = DEFAULT_MQTT_PASSWORD;
static const char MQTT_CLIENT_ID[] = DEFAULT_MQTT_CLIENT_ID;
static const char MQTT_SECRET[] = SECRET;
static const char TOPIC_RELAY_POWER[] = "relay/power";
static const char TOPIC_STAT[] = "stat";
static const char TOPIC_STAT1[] = "stat1";
static const char TOPIC_ADMIN[] = "admin";
static const char TOPIC_RELAY[] = "relay";
using namespace homekit;
MQTT::MQTT() : client(wifiClient) {
randomSeed(micros());
wifiClient.setFingerprint(MQTT_CA_FINGERPRINT);
client.setServer(MQTT_SERVER, MQTT_PORT);
client.setCallback([&](char* topic, byte* payload, unsigned int length) {
this->callback(topic, payload, length);
});
}
void MQTT::connect() {
reconnect();
}
void MQTT::reconnect() {
char buf[128] {0};
if (client.connected()) {
PRINTLN("warning: already connected");
return;
}
// Attempt to connect
if (client.connect(MQTT_CLIENT_ID, MQTT_USERNAME, MQTT_PASSWORD)) {
PRINTLN("mqtt: connected");
sendInitialStat();
subscribe(TOPIC_RELAY);
subscribe(TOPIC_ADMIN);
} else {
PRINTF("mqtt: failed to connect, rc=%d\n", client.state());
wifiClient.getLastSSLError(buf, sizeof(buf));
PRINTF("SSL error: %s\n", buf);
reconnectTimer.once(2, [&]() {
reconnect();
});
}
}
void MQTT::disconnect() {
// TODO test how this works???
reconnectTimer.detach();
client.disconnect();
wifiClient.stop();
}
bool MQTT::loop() {
return client.loop();
}
bool MQTT::publish(const char* topic, uint8_t *payload, size_t length) {
char full_topic[40] {0};
strcpy(full_topic, "/hk/");
strcat(full_topic, wifi::NODE_ID);
strcat(full_topic, "/");
strcat(full_topic, topic);
return client.publish(full_topic, payload, length);
}
bool MQTT::subscribe(const char *topic) {
char full_topic[40] {0};
strcpy(full_topic, "/hk/");
strcat(full_topic, wifi::NODE_ID);
strcat(full_topic, "/");
strcat(full_topic, topic);
strcat(full_topic, "/#");
bool res = client.subscribe(full_topic, 1);
if (!res)
PRINTF("error: failed to subscribe to %s\n", full_topic);
return res;
}
void MQTT::sendInitialStat() {
auto cfg = config::read();
InitialStatPayload stat {
.ip = wifi::getIPAsInteger(),
.fw_version = FW_VERSION,
.rssi = wifi::getRSSI(),
.free_heap = ESP.getFreeHeap(),
.flags = StatFlags {
.state = static_cast<uint8_t>(relay::getState() ? 1 : 0),
.config_changed_value_present = 1,
.config_changed = static_cast<uint8_t>(cfg.flags.node_configured || cfg.flags.wifi_configured ? 1 : 0)
}
};
publish(TOPIC_STAT1, reinterpret_cast<uint8_t*>(&stat), sizeof(stat));
statStopWatch.save();
}
void MQTT::sendStat() {
StatPayload stat {
.rssi = wifi::getRSSI(),
.free_heap = ESP.getFreeHeap(),
.flags = StatFlags {
.state = static_cast<uint8_t>(relay::getState() ? 1 : 0),
.config_changed_value_present = 0,
.config_changed = 0
}
};
PRINTF("free heap: %d\n", ESP.getFreeHeap());
publish(TOPIC_STAT, reinterpret_cast<uint8_t*>(&stat), sizeof(stat));
statStopWatch.save();
}
void MQTT::callback(char* topic, uint8_t* payload, uint32_t length) {
const size_t bufsize = 16;
char relevant_topic[bufsize];
strncpy(relevant_topic, topic+strlen(wifi::NODE_ID)+5, bufsize);
if (strncmp(TOPIC_RELAY_POWER, relevant_topic, bufsize) == 0) {
handleRelayPowerPayload(payload, length);
} else {
PRINTF("error: invalid topic %s\n", topic);
}
}
void MQTT::handleRelayPowerPayload(uint8_t *payload, uint32_t length) {
if (length != sizeof(PowerPayload)) {
PRINTF("error: size of payload (%ul) does not match expected (%ul)\n",
length, sizeof(PowerPayload));
return;
}
auto pd = reinterpret_cast<struct PowerPayload*>(payload);
if (strncmp(pd->secret, MQTT_SECRET, sizeof(pd->secret)) != 0) {
PRINTLN("error: invalid secret");
return;
}
if (pd->state == 1) {
relay::setOn();
} else if (pd->state == 0) {
relay::setOff();
} else {
PRINTLN("error: unexpected state value");
}
sendStat();
}
}
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