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mhsw-espurna/code/espurna/thingspeak.cpp

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/*
THINGSPEAK MODULE
Copyright (C) 2019 by Xose Pérez <xose dot perez at gmail dot com>
*/
#include "thingspeak.h"
#if THINGSPEAK_SUPPORT
#include <memory>
#include "broker.h"
#include "relay.h"
#include "rpc.h"
#include "sensor.h"
#include "ws.h"
#include "libs/URL.h"
#include "libs/SecureClientHelpers.h"
#include "libs/AsyncClientHelpers.h"
#if SECURE_CLIENT != SECURE_CLIENT_NONE
#if THINGSPEAK_SECURE_CLIENT_INCLUDE_CA
#include "static/thingspeak_client_trusted_root_ca.h"
#else
#include "static/digicert_high_assurance_pem.h"
#define _tspk_client_trusted_root_ca _ssl_digicert_high_assurance_ev_root_ca
#endif
#endif // SECURE_CLIENT != SECURE_CLIENT_NONE
const char THINGSPEAK_REQUEST_TEMPLATE[] PROGMEM =
"POST %s HTTP/1.1\r\n"
"Host: %s\r\n"
"User-Agent: ESPurna\r\n"
"Connection: close\r\n"
"Content-Type: application/x-www-form-urlencoded\r\n"
"Content-Length: %d\r\n\r\n";
bool _tspk_enabled = false;
bool _tspk_clear = false;
char * _tspk_queue[THINGSPEAK_FIELDS] = {NULL};
String _tspk_data;
bool _tspk_flush = false;
unsigned long _tspk_last_flush = 0;
unsigned char _tspk_tries = THINGSPEAK_TRIES;
#if THINGSPEAK_USE_ASYNC
class AsyncThingspeak : public AsyncClient {
public:
URL address;
AsyncThingspeak(const String& _url) : address(_url) { };
bool connect() {
#if ASYNC_TCP_SSL_ENABLED && THINGSPEAK_USE_SSL
return AsyncClient::connect(address.host.c_str(), address.port, true);
#else
return AsyncClient::connect(address.host.c_str(), address.port);
#endif
}
bool connect(const String& url) {
address = url;
return connect();
}
};
AsyncThingspeak* _tspk_client = nullptr;
AsyncClientState _tspk_state = AsyncClientState::Disconnected;
#endif // THINGSPEAK_USE_ASYNC == 1
// -----------------------------------------------------------------------------
void _tspkBrokerCallback(const String& topic, unsigned char id, unsigned int value) {
// Only process status messages for switches
if (!topic.equals(MQTT_TOPIC_RELAY)) {
return;
}
tspkEnqueueRelay(id, value > 0);
tspkFlush();
}
#if WEB_SUPPORT
bool _tspkWebSocketOnKeyCheck(const char * key, JsonVariant& value) {
return (strncmp(key, "tspk", 4) == 0);
}
void _tspkWebSocketOnVisible(JsonObject& root) {
root["tspkVisible"] = static_cast<unsigned char>(haveRelaysOrSensors());
}
void _tspkWebSocketOnConnected(JsonObject& root) {
root["tspkEnabled"] = getSetting("tspkEnabled", 1 == THINGSPEAK_ENABLED);
root["tspkKey"] = getSetting("tspkKey", THINGSPEAK_APIKEY);
root["tspkClear"] = getSetting("tspkClear", 1 == THINGSPEAK_CLEAR_CACHE);
root["tspkAddress"] = getSetting("tspkAddress", THINGSPEAK_ADDRESS);
JsonArray& relays = root.createNestedArray("tspkRelays");
for (unsigned char i=0; i<relayCount(); i++) {
relays.add(getSetting({"tspkRelay", i}, 0));
}
#if SENSOR_SUPPORT
sensorWebSocketMagnitudes(root, "tspk");
#endif
}
#endif
void _tspkInitClient(const String& _url);
void _tspkConfigure() {
_tspk_clear = getSetting("tspkClear", 1 == THINGSPEAK_CLEAR_CACHE);
_tspk_enabled = getSetting("tspkEnabled", 1 == THINGSPEAK_ENABLED);
if (_tspk_enabled && (getSetting("tspkKey", THINGSPEAK_APIKEY).length() == 0)) {
_tspk_enabled = false;
setSetting("tspkEnabled", 0);
}
#if THINGSPEAK_USE_ASYNC
if (_tspk_enabled && !_tspk_client) _tspkInitClient(getSetting("tspkAddress", THINGSPEAK_ADDRESS));
#endif
}
void _tspkClearQueue() {
_tspk_tries = THINGSPEAK_TRIES;
if (_tspk_clear) {
for (unsigned char id=0; id<THINGSPEAK_FIELDS; id++) {
if (_tspk_queue[id] != NULL) {
free(_tspk_queue[id]);
_tspk_queue[id] = NULL;
}
}
}
}
void _tspkRetry(int code) {
if ((0 == code) && _tspk_tries) {
_tspk_flush = true;
DEBUG_MSG_P(PSTR("[THINGSPEAK] Re-enqueuing %u more time(s)\n"), _tspk_tries);
} else {
_tspkClearQueue();
}
}
#if THINGSPEAK_USE_ASYNC
enum class tspk_state_t : uint8_t {
NONE,
HEADERS,
BODY
};
tspk_state_t _tspk_client_state = tspk_state_t::NONE;
unsigned long _tspk_client_ts = 0;
constexpr unsigned long THINGSPEAK_CLIENT_TIMEOUT = 5000;
void _tspkInitClient(const String& _url) {
_tspk_client = new AsyncThingspeak(_url);
_tspk_client->onDisconnect([](void * s, AsyncClient * client) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Disconnected\n"));
_tspk_data = "";
_tspk_client_ts = 0;
_tspk_last_flush = millis();
_tspk_state = AsyncClientState::Disconnected;
_tspk_client_state = tspk_state_t::NONE;
}, nullptr);
_tspk_client->onTimeout([](void * s, AsyncClient * client, uint32_t time) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Network timeout after %ums\n"), time);
client->close(true);
}, nullptr);
_tspk_client->onPoll([](void * s, AsyncClient * client) {
uint32_t ts = millis() - _tspk_client_ts;
if (ts > THINGSPEAK_CLIENT_TIMEOUT) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] No response after %ums\n"), ts);
client->close(true);
}
}, nullptr);
_tspk_client->onData([](void * arg, AsyncClient * client, void * response, size_t len) {
char * p = nullptr;
do {
p = nullptr;
switch (_tspk_client_state) {
case tspk_state_t::NONE:
{
p = strnstr(reinterpret_cast<const char *>(response), "HTTP/1.1 200 OK", len);
if (!p) {
client->close(true);
return;
}
_tspk_client_state = tspk_state_t::HEADERS;
continue;
}
case tspk_state_t::HEADERS:
{
p = strnstr(reinterpret_cast<const char *>(response), "\r\n\r\n", len);
if (!p) return;
_tspk_client_state = tspk_state_t::BODY;
}
case tspk_state_t::BODY:
{
if (!p) {
p = strnstr(reinterpret_cast<const char *>(response), "\r\n\r\n", len);
if (!p) return;
}
unsigned int code = (p) ? atoi(&p[4]) : 0;
DEBUG_MSG_P(PSTR("[THINGSPEAK] Response value: %u\n"), code);
_tspkRetry(code);
client->close(true);
_tspk_client_state = tspk_state_t::NONE;
}
}
} while (_tspk_client_state != tspk_state_t::NONE);
}, nullptr);
_tspk_client->onConnect([](void * arg, AsyncClient * client) {
_tspk_state = AsyncClientState::Disconnected;
AsyncThingspeak* tspk_client = reinterpret_cast<AsyncThingspeak*>(client);
DEBUG_MSG_P(PSTR("[THINGSPEAK] Connected to %s:%u\n"), tspk_client->address.host.c_str(), tspk_client->address.port);
#if THINGSPEAK_USE_SSL
uint8_t fp[20] = {0};
sslFingerPrintArray(THINGSPEAK_FINGERPRINT, fp);
SSL * ssl = tspk_client->getSSL();
if (ssl_match_fingerprint(ssl, fp) != SSL_OK) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Warning: certificate doesn't match\n"));
}
#endif
DEBUG_MSG_P(PSTR("[THINGSPEAK] POST %s?%s\n"), tspk_client->address.path.c_str(), _tspk_data.c_str());
char headers[strlen_P(THINGSPEAK_REQUEST_TEMPLATE) + tspk_client->address.path.length() + tspk_client->address.host.length() + 1];
snprintf_P(headers, sizeof(headers),
THINGSPEAK_REQUEST_TEMPLATE,
tspk_client->address.path.c_str(),
tspk_client->address.host.c_str(),
_tspk_data.length()
);
client->write(headers);
client->write(_tspk_data.c_str());
}, nullptr);
}
void _tspkPost(const String& address) {
if (_tspk_state != AsyncClientState::Disconnected) return;
_tspk_client_ts = millis();
_tspk_state = _tspk_client->connect(address)
? AsyncClientState::Connecting
: AsyncClientState::Disconnected;
if (_tspk_state == AsyncClientState::Disconnected) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Connection failed\n"));
_tspk_client->close(true);
}
}
#else // THINGSPEAK_USE_ASYNC
#if THINGSPEAK_USE_SSL && (SECURE_CLIENT == SECURE_CLIENT_BEARSSL)
SecureClientConfig _tspk_sc_config {
"THINGSPEAK",
[]() -> int {
return getSetting("tspkScCheck", THINGSPEAK_SECURE_CLIENT_CHECK);
},
[]() -> PGM_P {
return _tspk_client_trusted_root_ca;
},
[]() -> String {
return getSetting("tspkFP", THINGSPEAK_FINGERPRINT);
},
[]() -> uint16_t {
return getSetting("tspkScMFLN", THINGSPEAK_SECURE_CLIENT_MFLN);
},
true
};
#endif // THINGSPEAK_USE_SSL && SECURE_CLIENT_BEARSSL
void _tspkPost(WiFiClient& client, const URL& url, bool https) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] POST %s?%s\n"), url.path.c_str(), _tspk_data.c_str());
HTTPClient http;
http.begin(client, url.host, url.port, url.path, https);
http.addHeader("User-agent", "ESPurna");
http.addHeader("Content-Type", "application/x-www-form-urlencoded");
const auto http_code = http.POST(_tspk_data);
int value = 0;
if (http_code == 200) {
value = http.getString().toInt();
DEBUG_MSG_P(PSTR("[THINGSPEAK] Response value: %u\n"), value);
} else {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Response HTTP code: %d\n"), http_code);
}
_tspkRetry(value);
_tspk_data = "";
}
void _tspkPost(const String& address) {
const URL url(address);
#if SECURE_CLIENT == SECURE_CLIENT_BEARSSL
if (url.protocol == "https") {
const int check = _tspk_sc_config.on_check();
if (!ntpSynced() && (check == SECURE_CLIENT_CHECK_CA)) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Time not synced! Cannot use CA validation\n"));
return;
}
auto client = std::make_unique<SecureClient>(_tspk_sc_config);
if (!client->beforeConnected()) {
return;
}
_tspkPost(client->get(), url, true);
return;
}
#endif
if (url.protocol == "http") {
auto client = std::make_unique<WiFiClient>();
_tspkPost(*client.get(), url, false);
return;
}
}
#endif // THINGSPEAK_USE_ASYNC
void _tspkEnqueue(unsigned char index, const char * payload) {
DEBUG_MSG_P(PSTR("[THINGSPEAK] Enqueuing field #%u with value %s\n"), index, payload);
--index;
if (_tspk_queue[index] != NULL) free(_tspk_queue[index]);
_tspk_queue[index] = strdup(payload);
}
void _tspkFlush() {
if (!_tspk_flush) return;
if (millis() - _tspk_last_flush < THINGSPEAK_MIN_INTERVAL) return;
#if THINGSPEAK_USE_ASYNC
if (_tspk_state != AsyncClientState::Disconnected) return;
#endif
_tspk_last_flush = millis();
_tspk_flush = false;
_tspk_data.reserve(tspkDataBufferSize);
// Walk the fields, numbered 1...THINGSPEAK_FIELDS
for (unsigned char id=0; id<THINGSPEAK_FIELDS; id++) {
if (_tspk_queue[id] != NULL) {
if (_tspk_data.length() > 0) _tspk_data.concat("&");
char buf[32] = {0};
snprintf_P(buf, sizeof(buf), PSTR("field%u=%s"), (id + 1), _tspk_queue[id]);
_tspk_data.concat(buf);
}
}
// POST data if any
if (_tspk_data.length()) {
_tspk_data.concat("&api_key=");
_tspk_data.concat(getSetting("tspkKey", THINGSPEAK_APIKEY));
--_tspk_tries;
_tspkPost(getSetting("tspkAddress", THINGSPEAK_ADDRESS));
}
}
// -----------------------------------------------------------------------------
bool tspkEnqueueRelay(unsigned char index, bool status) {
if (!_tspk_enabled) return true;
unsigned char id = getSetting({"tspkRelay", index}, 0);
if (id > 0) {
_tspkEnqueue(id, status ? "1" : "0");
return true;
}
return false;
}
bool tspkEnqueueMeasurement(unsigned char index, const char * payload) {
if (!_tspk_enabled) return true;
const auto id = getSetting({"tspkMagnitude", index}, 0);
if (id > 0) {
_tspkEnqueue(id, payload);
return true;
}
return false;
}
void tspkFlush() {
_tspk_flush = true;
}
bool tspkEnabled() {
return _tspk_enabled;
}
void tspkLoop() {
if (!_tspk_enabled) return;
if (!wifiConnected() || (WiFi.getMode() != WIFI_STA)) return;
_tspkFlush();
}
void tspkSetup() {
_tspkConfigure();
#if WEB_SUPPORT
wsRegister()
.onVisible(_tspkWebSocketOnVisible)
.onConnected(_tspkWebSocketOnConnected)
.onKeyCheck(_tspkWebSocketOnKeyCheck);
#endif
StatusBroker::Register(_tspkBrokerCallback);
DEBUG_MSG_P(PSTR("[THINGSPEAK] Async %s, SSL %s\n"),
THINGSPEAK_USE_ASYNC ? "ENABLED" : "DISABLED",
THINGSPEAK_USE_SSL ? "ENABLED" : "DISABLED"
);
// Main callbacks
espurnaRegisterLoop(tspkLoop);
espurnaRegisterReload(_tspkConfigure);
}
#endif