diff --git a/extras/AT Command Manuals/Sequans Monarch AT Commands Manual.pdf b/extras/AT Command Manuals/Sequans Monarch AT Commands Manual.pdf
new file mode 100644
index 0000000..84c8f7c
Binary files /dev/null and b/extras/AT Command Manuals/Sequans Monarch AT Commands Manual.pdf differ
diff --git a/src/TinyGsmClient.h b/src/TinyGsmClient.h
index 0ba7ca3..2e4218e 100644
--- a/src/TinyGsmClient.h
+++ b/src/TinyGsmClient.h
@@ -96,6 +96,15 @@
   typedef TinyGsmXBee::GsmClient TinyGsmClient;
   typedef TinyGsmXBee::GsmClientSecure TinyGsmClientSecure;
 
+#elif defined(TINY_GSM_MODEM_SEQUANS_MONARCH)
+  #define TINY_GSM_MODEM_HAS_GPRS
+  #define TINY_GSM_MODEM_HAS_SSL
+  #include <TinyGsmClientSequansMonarch.h>
+  typedef TinyGsmSequansMonarch TinyGsm;
+  typedef TinyGsmSequansMonarch::GsmClient TinyGsmClient;
+  typedef TinyGsmSequansMonarch::GsmClientSecure TinyGsmClientSecure;
+
+
 #else
   #error "Please define GSM modem model"
 #endif
diff --git a/src/TinyGsmClientSequansMonarch.h b/src/TinyGsmClientSequansMonarch.h
new file mode 100644
index 0000000..02cd12b
--- /dev/null
+++ b/src/TinyGsmClientSequansMonarch.h
@@ -0,0 +1,830 @@
+/**
+ * @file       TinyGsmClientSequansMonarch.h
+ * @author     Michael Krumpus
+ * @license    LGPL-3.0
+ * @copyright  Copyright (c) 2019 Michael Krumpus
+ * @date       Jan 2019
+ */
+
+#ifndef TinyGsmClientSequansMonarch_h
+#define TinyGsmClientSequansMonarch_h
+
+//#define TINY_GSM_DEBUG Serial
+//#define TINY_GSM_USE_HEX
+
+#if !defined(TINY_GSM_RX_BUFFER)
+  #define TINY_GSM_RX_BUFFER 64
+#endif
+
+#define TINY_GSM_MUX_COUNT 5
+
+#include <TinyGsmCommon.h>
+
+#define GSM_NL "\r\n"
+static const char GSM_OK[] TINY_GSM_PROGMEM = "OK" GSM_NL;
+static const char GSM_ERROR[] TINY_GSM_PROGMEM = "ERROR" GSM_NL;
+
+enum SimStatus {
+  SIM_ERROR = 0,
+  SIM_READY = 1,
+  SIM_LOCKED = 2,
+};
+
+enum RegStatus {
+  REG_UNREGISTERED = 0,
+  REG_SEARCHING    = 2,
+  REG_DENIED       = 3,
+  REG_OK_HOME      = 1,
+  REG_OK_ROAMING   = 5,
+  REG_UNKNOWN      = 4,
+};
+
+#define NUM_SOCKETS 6
+
+enum SocketStatus {
+  SOCK_CLOSED                 = 0,
+  SOCK_ACTIVE_DATA            = 1,
+  SOCK_SUSPENDED              = 2,
+  SOCK_SUSPENDED_PENDING_DATA = 3,
+  SOCK_LISTENING              = 4,
+  SOCK_INCOMING               = 5,
+  SOCK_OPENING                = 6,
+};
+
+
+class TinyGsmSequansMonarch
+{
+
+public:
+
+class GsmClient : public Client
+{
+  friend class TinyGsmSequansMonarch;
+  typedef TinyGsmFifo<uint8_t, TINY_GSM_RX_BUFFER> RxFifo;
+
+public:
+  GsmClient() {}
+
+  GsmClient(TinyGsmSequansMonarch& modem, uint8_t mux = 1) {
+    init(&modem, mux);
+  }
+
+  bool init(TinyGsmSequansMonarch* modem, uint8_t mux = 1) {
+    this->at = modem;
+    this->mux = mux;
+    sock_available = 0;
+    prev_check = 0;
+    sock_connected = false;
+    got_data = false;
+
+    at->sockets[mux] = this;
+
+    return true;
+  }
+
+public:
+  virtual int connect(const char *host, uint16_t port) {
+    if (sock_connected) stop();
+    TINY_GSM_YIELD();
+    rx.clear();
+    sock_connected = at->modemConnect(host, port, mux);
+    return sock_connected;
+  }
+
+  virtual int connect(IPAddress ip, uint16_t port) {
+    String host; host.reserve(16);
+    host += ip[0];
+    host += ".";
+    host += ip[1];
+    host += ".";
+    host += ip[2];
+    host += ".";
+    host += ip[3];
+    return connect(host.c_str(), port);
+  }
+
+  virtual void stop() {
+    TINY_GSM_YIELD();
+    at->sendAT(GF("+SQNSH="), mux);
+    sock_connected = false;
+    at->waitResponse();
+    rx.clear();
+  }
+
+  virtual size_t write(const uint8_t *buf, size_t size) {
+    TINY_GSM_YIELD();
+    at->maintain();
+    return at->modemSend(buf, size, mux);
+  }
+
+  virtual size_t write(uint8_t c) {
+    return write(&c, 1);
+  }
+
+  virtual int available() {
+    TINY_GSM_YIELD();
+    if (!rx.size()) {
+      // Workaround: sometimes unsolicited SQNSSRING notifications do not arrive.
+      if (millis() - prev_check > 500) {
+        got_data = true;
+        prev_check = millis();
+      }
+      at->maintain();
+    }
+    return rx.size() + sock_available;
+  }
+
+  virtual int read(uint8_t *buf, size_t size) {
+    TINY_GSM_YIELD();
+    at->maintain();
+    size_t cnt = 0;
+    while (cnt < size) {
+      size_t chunk = TinyGsmMin(size-cnt, rx.size());
+      if (chunk > 0) {
+        rx.get(buf, chunk);
+        buf += chunk;
+        cnt += chunk;
+        continue;
+      }
+      // TODO: Read directly into user buffer?
+      at->maintain();
+      if (sock_available > 0) {
+        int n = at->modemRead(rx.free(), mux);
+        if (n == 0) break;
+      } else {
+        break;
+      }
+    }
+    return cnt;
+  }
+
+  virtual int read() {
+    uint8_t c;
+    if (read(&c, 1) == 1) {
+      return c;
+    }
+    return -1;
+  }
+
+  virtual int peek() { return -1; } //TODO
+  virtual void flush() {
+    at->stream.flush();
+  }
+
+  virtual uint8_t connected() {
+    if (available()) {
+      return true;
+    }
+    return got_data || sock_connected;
+  }
+  virtual operator bool() { return connected(); }
+
+  /*
+   * Extended API
+   */
+
+  String remoteIP() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+private:
+  TinyGsmSequansMonarch* at;
+  uint8_t       mux;
+  uint16_t      sock_available;
+  uint32_t      prev_check;
+  bool          sock_connected;
+  bool          got_data;
+  RxFifo        rx;
+};
+
+class GsmClientSecure : public GsmClient
+{
+public:
+  GsmClientSecure() {}
+
+  GsmClientSecure(TinyGsmSequansMonarch& modem, uint8_t mux = 1)
+    : GsmClient(modem, mux)
+  {}
+
+protected:
+  bool          strictSSL = false;
+
+public:
+  virtual int connect(const char *host, uint16_t port) {
+    if (sock_connected) stop();
+    TINY_GSM_YIELD();
+    rx.clear();
+
+    // configure security profile 1 with parameters:
+    if (strictSSL) {
+      // require minimum of TLS 1.2 (3)
+      // only support cipher suite 0x3D: TLS_RSA_WITH_AES_256_CBC_SHA256
+      // verify server certificate against imported CA certs 0 and enforce validity period (3)
+      at->sendAT(GF("+SQNSPCFG=1,3,\"0x3D\",3,0,,,\"\",\"\""));
+    } else {
+      // use TLS 1.0 or higher (1)
+      // support wider variety of cipher suites
+      // do not verify server certificate (0)
+      at->sendAT(GF("+SQNSPCFG=1,1,\"0x2F;0x35;0x3C;0x3D\",0,,,,\"\",\"\""));
+    }
+    if (at->waitResponse() != 1) {
+      DBG("failed to configure security profile");
+      return false;
+    }
+
+    sock_connected = at->modemConnect(host, port, mux, true);
+    return sock_connected;
+  }
+
+  void setStrictSSL(bool strict) {
+    strictSSL = strict;
+  }
+
+};
+
+public:
+
+  TinyGsmSequansMonarch(Stream& stream)
+    : stream(stream)
+  {
+    memset(sockets, 0, sizeof(sockets));
+  }
+
+  /*
+   * Basic functions
+   */
+  bool begin() {
+    return init();
+  }
+
+  bool init() {
+    DBG(GF("### TinyGSM Version:"), TINYGSM_VERSION);
+    if (!testAT()) {
+      return false;
+    }
+    sendAT(GF("E0"));   // Echo Off
+    if (waitResponse() != 1) {
+      return false;
+    }
+    getSimStatus();
+    return true;
+  }
+
+  void setBaud(unsigned long baud) {
+    sendAT(GF("+IPR="), baud);
+  }
+
+  bool testAT(unsigned long timeout = 10000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      sendAT(GF(""));
+      if (waitResponse(200) == 1) {
+          delay(100);
+          return true;
+      }
+      delay(100);
+    }
+    return false;
+  }
+
+  void maintain() {
+    for (int mux = 0; mux < TINY_GSM_MUX_COUNT; mux++) {
+      GsmClient* sock = sockets[mux];
+      if (sock && sock->got_data) {
+        sock->got_data = false;
+        sock->sock_available = modemGetAvailable(mux);
+      }
+    }
+
+    while (stream.available()) {
+      waitResponse(10, NULL, NULL);
+    }
+  }
+
+  bool factoryDefault() {
+    sendAT(GF("&FZE0&W"));  // Factory + Reset + Echo Off + Write
+    waitResponse();
+    sendAT(GF("+IPR=0"));   // Auto-baud
+    waitResponse();
+    sendAT(GF("+IFC=0,0")); // No Flow Control
+    waitResponse();
+    sendAT(GF("+ICF=3,3")); // 8 data 0 parity 1 stop
+    waitResponse();
+    sendAT(GF("+CSCLK=0")); // Disable Slow Clock
+    waitResponse();
+    sendAT(GF("&W"));       // Write configuration
+    return waitResponse() == 1;
+  }
+
+  String getModemInfo() {
+    sendAT(GF("I"));
+    String res;
+    if (waitResponse(1000L, res) != 1) {
+      return "";
+    }
+    res.replace(GSM_NL "OK" GSM_NL, "");
+    res.replace(GSM_NL, " ");
+    res.trim();
+    return res;
+  }
+
+  bool hasSSL() {
+    return true;
+  }
+
+  /*
+   * Power functions
+   */
+
+  bool restart() {
+    if (!testAT()) {
+      return false;
+    }
+
+    sendAT(GF("+CFUN=0"));
+    if (waitResponse(10000L) != 1) {
+      return false;
+    }
+
+    sendAT(GF("+CFUN=1,1"));
+    if (waitResponse(60000L, GF("+SYSSTART")) != 1) {
+      return false;
+    }
+    delay(1000);
+    return init();
+  }
+
+  bool poweroff() {
+    sendAT(GF("+SQNSSHDN"));
+    return waitResponse();
+  }
+
+  bool radioOff() {
+    sendAT(GF("+CFUN=0"));
+    if (waitResponse(10000L) != 1) {
+      return false;
+    }
+    delay(3000);
+    return true;
+  }
+
+  /*
+    During sleep, the SIM800 module has its serial communication disabled. In order to reestablish communication
+    pull the DRT-pin of the SIM800 module LOW for at least 50ms. Then use this function to disable sleep mode.
+    The DTR-pin can then be released again.
+  */
+  bool sleepEnable(bool enable = true) {
+    sendAT(GF("+CSCLK="), enable);
+    return waitResponse() == 1;
+  }
+
+  /*
+   * SIM card functions
+   */
+
+  bool simUnlock(const char *pin) {
+    sendAT(GF("+CPIN=\""), pin, GF("\""));
+    return waitResponse() == 1;
+  }
+
+  String getSimCCID() {
+    sendAT(GF("+SQNCCID"));
+    if (waitResponse(GF(GSM_NL "+SQNCCID:")) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  String getIMEI() {
+    sendAT(GF("+GSN"));
+    if (waitResponse(GF(GSM_NL)) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\n');
+    waitResponse();
+    res.trim();
+    return res;
+  }
+
+  SimStatus getSimStatus(unsigned long timeout = 10000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      sendAT(GF("+CPIN?"));
+      if (waitResponse(GF(GSM_NL "+CPIN:")) != 1) {
+        delay(1000);
+        continue;
+      }
+      int status = waitResponse(GF("READY"), GF("SIM PIN"), GF("SIM PUK"), GF("NOT INSERTED"));
+      waitResponse();
+      switch (status) {
+      case 2:
+      case 3:  return SIM_LOCKED;
+      case 1:  return SIM_READY;
+      default: return SIM_ERROR;
+      }
+    }
+    return SIM_ERROR;
+  }
+
+  RegStatus getRegistrationStatus() {
+    //sendAT(GF("+CREG?"));
+    sendAT(GF("+CEREG?"));
+    if (waitResponse(GF(GSM_NL "+CEREG:")) != 1) {
+      return REG_UNKNOWN;
+    }
+    streamSkipUntil(','); // Skip format (0)
+    int status = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return (RegStatus)status;
+  }
+
+  String getOperator() {
+    sendAT(GF("+COPS?"));
+    if (waitResponse(GF(GSM_NL "+COPS:")) != 1) {
+      return "";
+    }
+    streamSkipUntil('"'); // Skip mode and format
+    String res = stream.readStringUntil('"');
+    waitResponse();
+    return res;
+  }
+
+  /*
+   * Generic network functions
+   */
+
+  int getSignalQuality() {
+    sendAT(GF("+CSQ"));
+    if (waitResponse(GF(GSM_NL "+CSQ:")) != 1) {
+      return 99;
+    }
+    int res = stream.readStringUntil(',').toInt();
+    waitResponse();
+    return res;
+  }
+
+  bool isNetworkConnected() {
+    RegStatus s = getRegistrationStatus();
+    if (s == REG_OK_HOME || s == REG_OK_ROAMING) {
+      DBG(F("connected with status:"), s);
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  bool waitForNetwork(unsigned long timeout = 60000L) {
+    for (unsigned long start = millis(); millis() - start < timeout; ) {
+      if (isNetworkConnected()) {
+        return true;
+      }
+      delay(250);
+    }
+    return false;
+  }
+
+  /*
+   * GPRS functions
+   */
+  bool gprsConnect(const char* apn, const char* user = NULL, const char* pwd = NULL) {
+    gprsDisconnect();
+
+    // Define the PDP context
+    sendAT(GF("+CGDCONT=3,\"IPV4V6\",\""), apn, '"');
+    waitResponse();
+
+    if (user && strlen(user) > 0) {
+      sendAT(GF("+CGAUTH=3,1,\""), user, GF("\",\""), pwd, GF("\""));
+      waitResponse();
+    }
+
+    // Activate the PDP context
+    sendAT(GF("+CGACT=1,3"));
+    waitResponse(60000L);
+
+    // Attach to GPRS
+    sendAT(GF("+CGATT=1"));
+    if (waitResponse(60000L) != 1)
+      return false;
+
+    return true;
+  }
+
+  bool gprsDisconnect() {
+    sendAT(GF("+CGATT=0"));
+    if (waitResponse(60000L) != 1)
+      return false;
+
+    return true;
+  }
+
+
+  bool isGprsConnected() {
+    sendAT(GF("+CGATT?"));
+    if (waitResponse(GF(GSM_NL "+CGATT:")) != 1) {
+      return false;
+    }
+    int res = stream.readStringUntil('\n').toInt();
+    waitResponse();
+    if (res != 1)
+      return false;
+
+    return true;
+  }
+
+  String getLocalIP() {
+    sendAT(GF("+CGPADDR=3"));
+
+    if (waitResponse(10000L, GF("+CGPADDR: 3,\"")) != 1) {
+      return "";
+    }
+    String res = stream.readStringUntil('\"');
+    waitResponse();
+    return res;
+  }
+
+  IPAddress localIP() {
+    return TinyGsmIpFromString(getLocalIP());
+  }
+
+  /*
+   * Phone Call functions
+   */
+
+  bool setGsmBusy(bool busy = true) TINY_GSM_ATTR_NOT_AVAILABLE;
+
+  bool callAnswer() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+  bool callNumber(const String& number) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+  bool callHangup() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+  String sendUSSD(const String& code) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+  bool sendSMS(const String& number, const String& text) {
+    sendAT(GF("+CMGF=1"));
+    waitResponse();
+    //Set GSM 7 bit default alphabet (3GPP TS 23.038)
+    sendAT(GF("+CSCS=\"GSM\""));
+    waitResponse();
+
+    sendAT(GF("+CMGS=\""), number, GF("\""));
+    if (waitResponse(GF(">")) != 1) {
+      return false;
+    }
+    stream.print(text);
+    stream.write((char)0x1A);
+    stream.flush();
+    return waitResponse(60000L) == 1;
+  }
+
+  bool sendSMS_UTF16(const String& number, const void* text, size_t len) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
+  /*
+   * Location functions
+   */
+  String getGsmLocation() TINY_GSM_ATTR_NOT_AVAILABLE;
+
+  /*
+   * Battery functions
+   */
+  uint16_t getBattVoltage() TINY_GSM_ATTR_NOT_AVAILABLE;
+
+  int getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
+
+protected:
+
+  bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
+    int rsp;
+
+    if (ssl) {
+      // enable SSl and use security profile 1
+      sendAT(GF("+SQNSSCFG="), mux, GF(",1,1"));
+      if (waitResponse() != 1) {
+        DBG("failed to configure secure socket");
+        return false;
+      }
+    }
+
+    sendAT(GF("+SQNSCFG="), mux, GF(",3,300,90,600,50"));
+    waitResponse();
+
+    sendAT(GF("+SQNSCFGEXT="), mux, GF(",1,0,0,0,0"));
+    waitResponse();
+
+    sendAT(GF("+SQNSD="), mux, ",0,", port, ',', GF("\""), host, GF("\""), ",0,0,1");
+    rsp = waitResponse(75000L,
+                      GF("OK" GSM_NL),
+                      GF("NO CARRIER" GSM_NL)
+                      );
+
+    // creation of socket failed immediately.
+    if (rsp != 1) return rsp;
+
+    // wait until we get a good status
+    unsigned long timeout = 5000;
+    unsigned long startMillis = millis();
+    bool connected = false;
+    while (!connected) {
+      connected = modemGetConnected(mux);
+      if (connected) {
+        delay(50);
+        break;
+      }
+      delay(100); // socket may be in opening state
+      if (millis() - startMillis < timeout) {
+        break;
+      }
+    }
+    return connected;
+  }
+
+
+  int modemSend(const void* buff, size_t len, uint8_t mux) {
+    sendAT(GF("+SQNSSENDEXT="), mux, ',', len);
+    if (waitResponse(5000, GF(GSM_NL "> ")) != 1) {
+      return 0;
+    }
+    stream.write((uint8_t*)buff, len);
+    stream.flush();
+    if (waitResponse() != 1) {
+      DBG("no OK after send");
+      return 0;
+    }
+    return len;
+  }
+
+
+  size_t modemRead(size_t size, uint8_t mux) {
+    sendAT(GF("+SQNSRECV="), mux, ',', size);
+    if (waitResponse(GF("+SQNSRECV: ")) != 1) {
+      return 0;
+    }
+    streamSkipUntil(','); // Skip mux
+    size_t len = stream.readStringUntil('\n').toInt();
+    for (size_t i=0; i<len; i++) {
+      while (!stream.available()) { TINY_GSM_YIELD(); }
+      char c = stream.read();
+      sockets[mux]->rx.put(c);
+    }
+    waitResponse();
+    sockets[mux]->sock_available = modemGetAvailable(mux);
+    return len;
+  }
+
+  size_t modemGetAvailable(uint8_t mux) {
+    sendAT(GF("+SQNSI="), mux);
+    size_t result = 0;
+    if (waitResponse(GF("+SQNSI:")) == 1) {
+      streamSkipUntil(','); // Skip mux
+      streamSkipUntil(','); // Skip sent
+      streamSkipUntil(','); // Skip received
+      result = stream.readStringUntil(',').toInt();
+      waitResponse();
+    }
+    if (!result) {
+      sockets[mux]->sock_connected = modemGetConnected(mux);
+    }
+    return result;
+  }
+
+  bool modemGetConnected(uint8_t mux) {
+    sendAT(GF("+SQNSS"));
+    uint8_t m = 0;
+    uint8_t status = 0;
+
+    while (true) {
+      if (waitResponse(GFP(GSM_OK), GF(GSM_NL "+SQNSS: ")) != 2) {
+        break;
+      };
+      m = stream.readStringUntil(',').toInt();
+      if (m == mux) {
+        status = stream.readStringUntil(',').toInt();
+      }
+      streamSkipUntil('\n'); // Skip
+    }
+
+    return ((status != SOCK_CLOSED) && (status != SOCK_INCOMING) && (status != SOCK_OPENING));
+  }
+
+public:
+
+  /* Utilities */
+
+  bool commandMode(int retries = 2) {
+    streamWrite(GF("+++"));  // enter command mode
+    return true;
+  }
+
+  template<typename T>
+  void streamWrite(T last) {
+    stream.print(last);
+  }
+
+  template<typename T, typename... Args>
+  void streamWrite(T head, Args... tail) {
+    stream.print(head);
+    streamWrite(tail...);
+  }
+
+  bool streamSkipUntil(char c) { //TODO: timeout
+    while (true) {
+      while (!stream.available()) { TINY_GSM_YIELD(); }
+      if (stream.read() == c)
+        return true;
+    }
+    return false;
+  }
+
+  template<typename... Args>
+  void sendAT(Args... cmd) {
+    streamWrite("AT", cmd..., '\r');
+    stream.flush();
+    TINY_GSM_YIELD();
+    DBG("### AT:", cmd...);
+  }
+
+  // TODO: Optimize this!
+  uint8_t waitResponse(uint32_t timeout, String& data,
+                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
+  {
+    /*String r1s(r1); r1s.trim();
+    String r2s(r2); r2s.trim();
+    String r3s(r3); r3s.trim();
+    String r4s(r4); r4s.trim();
+    String r5s(r5); r5s.trim();
+    DBG("### ..:", r1s, ",", r2s, ",", r3s, ",", r4s, ",", r5s);*/
+    data.reserve(64);
+    int index = 0;
+    unsigned long startMillis = millis();
+    do {
+      TINY_GSM_YIELD();
+      while (stream.available() > 0) {
+        int a = stream.read();
+        if (a <= 0) continue; // Skip 0x00 bytes, just in case
+        data += (char)a;
+        if (r1 && data.endsWith(r1)) {
+          index = 1;
+          goto finish;
+        } else if (r2 && data.endsWith(r2)) {
+          index = 2;
+          goto finish;
+        } else if (r3 && data.endsWith(r3)) {
+          index = 3;
+          goto finish;
+        } else if (r4 && data.endsWith(r4)) {
+          index = 4;
+          goto finish;
+        } else if (r5 && data.endsWith(r5)) {
+          index = 5;
+          goto finish;
+        } else if (data.endsWith(GF(GSM_NL "+SQNSRING:"))) {
+          int mux = stream.readStringUntil(',').toInt();
+          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
+            sockets[mux]->got_data = true;
+          }
+          stream.readStringUntil('\n');
+          data = "";
+        } else if (data.endsWith(GF("SQNSH: "))) {
+          int mux = stream.readStringUntil('\n').toInt();
+          if (mux >= 0 && mux < TINY_GSM_MUX_COUNT && sockets[mux]) {
+            sockets[mux]->sock_connected = false;
+          }
+          data = "";
+          DBG("### Closed: ", mux);
+        }
+      }
+    } while (millis() - startMillis < timeout);
+finish:
+    if (!index) {
+      data.trim();
+      if (data.length()) {
+        DBG("### Unhandled:", data);
+      }
+      data = "";
+    }
+    return index;
+  }
+
+  uint8_t waitResponse(uint32_t timeout,
+                       GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
+  {
+    String data;
+    return waitResponse(timeout, data, r1, r2, r3, r4, r5);
+  }
+
+  uint8_t waitResponse(GsmConstStr r1=GFP(GSM_OK), GsmConstStr r2=GFP(GSM_ERROR),
+                       GsmConstStr r3=NULL, GsmConstStr r4=NULL, GsmConstStr r5=NULL)
+  {
+    return waitResponse(1000, r1, r2, r3, r4, r5);
+  }
+
+public:
+  Stream&       stream;
+
+protected:
+  GsmClient*    sockets[TINY_GSM_MUX_COUNT];
+};
+
+#endif
diff --git a/src/TinyGsmClientUBLOX.h b/src/TinyGsmClientUBLOX.h
index 9fefc3d..c54c60c 100644
--- a/src/TinyGsmClientUBLOX.h
+++ b/src/TinyGsmClientUBLOX.h
@@ -62,10 +62,8 @@ public:
     sock_connected = false;
     got_data = false;
 
-    // at->sockets[mux] = this;
-    //  ^^ TODO: attach the socket here at init?  Or later at connect?
-    // Currently done inconsistently between modems
-
+    // Don't attach the socket here because we won't know the mux channel number
+    // until the u-blox assigns it upon opening the socket
     return true;
   }
 
@@ -93,8 +91,8 @@ public:
     // sock_connected = at->modemConnect(host, port, mux);
     sock_connected = at->modemConnect(host, port, &mux);
     at->sockets[mux] = this;
-    // ^^ TODO: attach the socket after attempting connection or above at init?
-    // Currently done inconsistently between modems
+    // Attach the socket after attempting connection because u-blox will assign
+    // whatever mux number is next regardless of the number requested.
     at->maintain();
     return sock_connected;
   }
diff --git a/src/TinyGsmCommon.h b/src/TinyGsmCommon.h
index 7d0db43..68bf900 100644
--- a/src/TinyGsmCommon.h
+++ b/src/TinyGsmCommon.h
@@ -35,7 +35,7 @@
 #endif
 
 #if !defined(TINY_GSM_RX_BUFFER)
-  #define TINY_GSM_RX_BUFFER 256
+  #define TINY_GSM_RX_BUFFER 64
 #endif
 
 #define TINY_GSM_ATTR_NOT_AVAILABLE __attribute__((error("Not available on this modem type")))
@@ -203,8 +203,6 @@ String TinyGsmDecodeHex16bit(String &instr) {
 }
 
 
-
-
 class TinyGsmModem
 {