Unable to allocate memory

I'm trying to send a SMS and read data from Firebase with my NodeMCU Amica V2. The code works fine when I either only send a SMS or only read data from Firebase. However, when I combine this two codes SMS isn't sent. This is the error I get:

+ Connected. + Post an HTTP send SMS request. + Connection is closed. + Response: 31.0630+ Using fingerprint 'BC B0 1A 32 80 5D E6 E4 A2 29 66 2B 08 C8 E0 4C 45 29 3F D0' + Connecting to api.twilio.com - Connection failed. Last SSL error was: Unable to allocate memory for SSL structures and buffers. ERRCODE: -1000 

And here is my code:

#include <ESP8266WiFi.h> #include <WiFiClientSecure.h> #include <base64.h> #include "OneWire.h" #include "DallasTemperature.h" #include <ArduinoJson.h> #include <string> using namespace std; #include <sstream> #include <iostream> #include "FirebaseArduino.h" // Your network SSID and password const char* ssid = "*****"; const char* password = "*****"; const char* account_sid = "*****"; const char* auth_token = "*****"; String to_number = "+*****"; String from_number = "+*****"; String message_body = "Hello from Twilio and the ESP8266!"; // Find the api.twilio.com SHA1 fingerprint using, // echo | openssl s_client -connect api.twilio.com:443 | openssl x509 -fingerprint const char fingerprint[] = "BC B0 1A 32 80 5D E6 E4 A2 29 66 2B 08 C8 E0 4C 45 29 3F D0"; #define ONE_WIRE_BUS 4 OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); #define FIREBASE_HOST "***.firebaseio.com" #define FIREBASE_AUTH "*****" float temp1 = 0; //float temp2 = 0; String b; int c; String urlencode(String str) { String encodedString = ""; char c; char code0; char code1; char code2; for (int i = 0; i < str.length(); i++) { c = str.charAt(i); if (c == ' ') { encodedString += '+'; } else if (isalnum(c)) { encodedString += c; } else { code1 = (c & 0xf) + '0'; if ((c & 0xf) > 9) { code1 = (c & 0xf) - 10 + 'A'; } c = (c >> 4) & 0xf; code0 = c + '0'; if (c > 9) { code0 = c - 10 + 'A'; } code2 = '\0'; encodedString += '%'; encodedString += code0; encodedString += code1; } yield(); } return encodedString; } String get_auth_header(const String& user, const String& password) { size_t toencodeLen = user.length() + password.length() + 2; char toencode[toencodeLen]; memset(toencode, 0, toencodeLen); snprintf(toencode, toencodeLen, "%s:%s", user.c_str(), password.c_str()); String encoded = base64::encode((uint8_t*)toencode, toencodeLen - 1); String encoded_string = String(encoded); std::string::size_type i = 0; // Strip newlines (after every 72 characters in spec) while (i < encoded_string.length()) { i = encoded_string.indexOf('\n', i); if (i == -1) { break; } encoded_string.remove(i, 1); } return "Authorization: Basic " + encoded_string; } void setup() { Serial.begin(115200); // 115200 or 9600 delay(1000); // Give the serial connection time to start before the first print. Serial.println(""); // Newline after garbage characters. Serial.println(F("+++ Setup.")); // ---------------------------------------------------- Serial.println("+ Connect to WiFi. "); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.print("."); } Serial.println(""); Serial.print("+ Connected to WiFi, IP address: "); Serial.println(WiFi.localIP()); // ---------------------------------------------------- sensors.begin(); Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH); } void loop() { sensors.requestTemperatures(); temp1 = sensors.getTempCByIndex(0); Serial.print(temp1); b = Firebase.getString("002/alarm"); c = b.toInt(); Serial.print(c); if (temp1 > c) { // Use WiFiClientSecure to create a TLS 1.2 connection. // Note, using a cert fingerprint is required. WiFiClientSecure client; client.setFingerprint(fingerprint); Serial.printf("+ Using fingerprint '%s'\n", fingerprint); const char* host = "api.twilio.com"; const int httpsPort = 443; Serial.print("+ Connecting to "); Serial.println(host); if (!client.connect(host, httpsPort)) { Serial.println("- Connection failed."); char buf[200]; int err = client.getLastSSLError(buf, 199); buf[199] = '\0'; Serial.println("Last SSL error was:"); Serial.println(buf); Serial.print("ERRCODE: "); Serial.println(err); ///* END snippet from pushdata-io project */ // return false; } Serial.println("+ Connected."); Serial.println("+ Post an HTTP send SMS request."); String post_data = "To=" + urlencode(to_number) + "&From=" + urlencode(from_number) + "&Body=" + urlencode(message_body); String auth_header = get_auth_header(account_sid, auth_token); String http_request = "POST /2010-04-01/Accounts/" + String(account_sid) + "/Messages HTTP/1.1\r\n" + auth_header + "\r\n" + "Host: " + host + "\r\n" + "Cache-control: no-cache\r\n" + "User-Agent: ESP8266 Twilio Example\r\n" + "Content-Type: application/x-www-form-urlencoded\r\n" + "Content-Length: " + post_data.length() + "\r\n" + "Connection: close\r\n" + "\r\n" + post_data + "\r\n"; client.println(http_request); // Read the response. String response = ""; while (client.connected()) { String line = client.readStringUntil('\n'); response += (line); response += ("\r\n"); } Serial.println("+ Connection is closed."); Serial.println("+ Response:"); Serial.println(response); } delay(5000); } 

Does that mean that the NodeMCU doesn't have enough memory? I also tried changing delay() to milis(), but that didn't solve the problem.

Any help would be appreciated!