diff --git a/host/host_central_mast/lib/NetworkConnectionManager/GPRSCredentials.h b/host/host_central_mast/lib/NetworkConnectionManager/GPRSCredentials.h
new file mode 100644
index 0000000000000000000000000000000000000000..8cc838eef9ed62a1b8014561f696c8a016ee1052
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/GPRSCredentials.h
@@ -0,0 +1,15 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#ifndef HOST_CENTRAL_MAST_GPRSCREDENTIALS_H
+#define HOST_CENTRAL_MAST_GPRSCREDENTIALS_H
+
+#include <string>
+
+struct GPRSCredentials {
+ std::string apn;
+ std::string user;
+ std::string password;
+};
+#endif //HOST_CENTRAL_MAST_GPRSCREDENTIALS_H
diff --git a/host/host_central_mast/lib/NetworkConnectionManager/LTEConnection.cpp b/host/host_central_mast/lib/NetworkConnectionManager/LTEConnection.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c509bf072ddfa235fab4debdacee361fa8ff096b
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/LTEConnection.cpp
@@ -0,0 +1,101 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#include "LTEConnection.h"
+#include "ModemFunctionalityLevel.h"
+#include "LTEConnectionException.hpp"
+
+#include <utility>
+
+std::string LTEConnection::connect(const std::string &host, const std::string &port) {
+ return std::__cxx11::string();
+}
+
+LTEConnection::LTEConnection(TinyGsm &client, GPRSCredentials credentials) : client(client),
+ credentials(
+ std::move(
+ credentials)) {}
+
+
+void LTEConnection::restartModem() {
+ // Restart takes quite some time
+ // To skip it, call init() instead of restart()
+ esp_log_write(ESP_LOG_DEBUG, TAG_GSM.c_str(), "Restarting modem...\n");
+ if (!client.restart()) {
+ esp_log_write(ESP_LOG_WARN, TAG_GSM.c_str(),
+ "Failed to restart modem, attempting to continue without restarting\n");
+ }
+}
+
+void LTEConnection::initModem() {
+ esp_log_write(ESP_LOG_DEBUG, TAG_GSM.c_str(), "Initializing modem...\n");
+ if (!client.init()) {
+ esp_log_write(ESP_LOG_WARN, TAG_GSM.c_str(),
+ "Failed to initialize modem, attempting to continue by restarting\n");
+ // might not be the cleanest design
+ restartModem();
+ }
+ setModemFunctionalityLevel(MINIMAL);
+}
+
+void
+LTEConnection::setModemFunctionalityLevel(
+ ModemFunctionalityLevel functionalityLevel) {// This sets the level of functionality of the modem. Full functionality is where the highest
+// level of power is drawn. Minimum functionality (default) is where the lowest level of power is drawn.
+// https://m2msupport.net/m2msupport/atcfun-set-phone-functionality/
+ client.sendAT(("+CFUN=" + std::to_string(ModemFunctionalityLevel::MINIMAL) + " ").c_str());
+ if (client.waitResponse(10000L) != 1) {
+ DBG(" +CFUN=0 false ");
+ }
+}
+
+void LTEConnection::disableGPS() {
+ // Set SIM7000G GPIO4 LOW ,turn off GPS power
+ // CMD:AT+SGPIO=0,4,1,0
+ // Only in version 20200415 is there a function to control GPS power
+ client.sendAT("+SGPIO=0,4,1,0");
+ if (client.waitResponse(10000L) != 1) {
+ DBG(" SGPIO=0,4,1,0 false ");
+ }
+ client.disableGPS();
+}
+
+void LTEConnection::enableGPS() {
+ // Set SIM7000G GPIO4 LOW ,turn on GPS power
+ // CMD:AT+SGPIO=0,4,1,1
+ // Only in version 20200415 is there a function to control GPS power
+ client.sendAT("+SGPIO=0,4,1,1");
+ if (client.waitResponse(10000L) != 1) {
+ DBG(" SGPIO=0,4,1,1 false ");
+ }
+ client.enableGPS();
+}
+
+void LTEConnection::setNetworkMode(NetworkMode networkMode) {
+
+ String res;
+ res = client.setNetworkMode(networkMode);
+ if (res != "1") {
+ DBG("setNetworkMode false ");
+ throw LTEConnectionException("Failed to set network mode");
+ }
+ delay(200);
+}
+
+void LTEConnection::setPreferredMode(Mode mode) {
+ /*AT+CBANDCFG=<mode>,<band>[,<band>…]
+ * <mode> "CAT-M" "NB-IOT"
+ * <band> The value of <band> must is in the band list of getting from AT+CBANDCFG=?
+ * For example, my SIM card carrier "NB-iot" supports B8. I will configure +CBANDCFG= "Nb-iot ",8
+ */
+ client.sendAT("+CBANDCFG=\"CAT-M\",8 ");
+ if (client.waitResponse(10000L) != 1) {
+ DBG(" +CBANDCFG=\"NB-IOT\" ");
+ }
+ delay(200);
+
+}
+
+
+
diff --git a/host/host_central_mast/lib/NetworkConnectionManager/LTEConnection.h b/host/host_central_mast/lib/NetworkConnectionManager/LTEConnection.h
new file mode 100644
index 0000000000000000000000000000000000000000..a02298769e52234bd458a1bcc013fed08f6bed4d
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/LTEConnection.h
@@ -0,0 +1,47 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#ifndef HOST_CENTRAL_MAST_LTECONNECTION_H
+#define HOST_CENTRAL_MAST_LTECONNECTION_H
+
+#define TINY_GSM_MODEM_SIM7000
+
+#include <TinyGsmClient.h>
+#include "GPRSCredentials.h"
+#include "StreamDebugger.h"
+#include "ModemFunctionalityLevel.h"
+#include "NetworkMode.h"
+#include "Mode.h"
+
+static const std::string TAG_GSM = "GSM";
+
+class LTEConnection {
+private:
+ TinyGsm &client;
+ const GPRSCredentials credentials;
+
+
+public:
+ LTEConnection(TinyGsm &client, GPRSCredentials credentials);
+
+
+ std::string connect(const std::string &host, const std::string &port);
+
+ void enableGPS();
+
+ void disableGPS();
+
+ void initModem();
+
+ void restartModem();
+
+ void setNetworkMode(NetworkMode networkMode = NetworkMode::LTE_ONLY);
+
+ void setPreferredMode(Mode mode = Mode::CAT_M);
+
+ void setModemFunctionalityLevel(ModemFunctionalityLevel functionalityLevel = MINIMAL);
+};
+
+
+#endif //HOST_CENTRAL_MAST_LTECONNECTION_H
diff --git a/host/host_central_mast/lib/NetworkConnectionManager/LTEConnectionException.hpp b/host/host_central_mast/lib/NetworkConnectionManager/LTEConnectionException.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..1c9067bdbab1a9721b1d41df2b0bbb3aef47bd66
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/LTEConnectionException.hpp
@@ -0,0 +1,23 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#ifndef HOST_CENTRAL_MAST_LTECONNECTIONEXCEPTION_HPP
+#define HOST_CENTRAL_MAST_LTECONNECTIONEXCEPTION_HPP
+
+#include <exception>
+#include <string>
+
+class LTEConnectionException : public std::exception {
+public:
+ explicit LTEConnectionException(const std::string &message) : message(message) {}
+
+ const char *what() const noexcept override {
+ return message.c_str();
+ }
+
+private:
+ std::string message;
+};
+
+#endif //HOST_CENTRAL_MAST_LTECONNECTIONEXCEPTION_HPP
diff --git a/host/host_central_mast/lib/NetworkConnectionManager/Mode.h b/host/host_central_mast/lib/NetworkConnectionManager/Mode.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb248b7920ad62aca446830742948f6fe8de2a95
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/Mode.h
@@ -0,0 +1,14 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#ifndef HOST_CENTRAL_MAST_MODE_H
+#define HOST_CENTRAL_MAST_MODE_H
+
+enum Mode {
+ CAT_M = 1,
+ NB_IOT = 2,
+ CAT_M_AND_NB_IOT = 3
+};
+
+#endif //HOST_CENTRAL_MAST_MODE_H
diff --git a/host/host_central_mast/lib/NetworkConnectionManager/ModemFunctionalityLevel.h b/host/host_central_mast/lib/NetworkConnectionManager/ModemFunctionalityLevel.h
new file mode 100644
index 0000000000000000000000000000000000000000..35a458033a388af7a8d7fe3a37649b5ffbc458e7
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/ModemFunctionalityLevel.h
@@ -0,0 +1,14 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#ifndef HOST_CENTRAL_MAST_MODEMFUNCTIONALITYLEVEL_H
+#define HOST_CENTRAL_MAST_MODEMFUNCTIONALITYLEVEL_H
+
+enum ModemFunctionalityLevel {
+ MINIMAL = 0,
+ FULL = 1,
+ DISABLE = 4,
+};
+
+#endif //HOST_CENTRAL_MAST_MODEMFUNCTIONALITYLEVEL_H
diff --git a/host/host_central_mast/lib/NetworkConnectionManager/NetworkMode.h b/host/host_central_mast/lib/NetworkConnectionManager/NetworkMode.h
new file mode 100644
index 0000000000000000000000000000000000000000..daafc19e6b94bcb6d6a818cb905606f559a23e04
--- /dev/null
+++ b/host/host_central_mast/lib/NetworkConnectionManager/NetworkMode.h
@@ -0,0 +1,15 @@
+//
+// Created by zoe on 12/20/22.
+//
+
+#ifndef HOST_CENTRAL_MAST_NETWORKMODE_H
+#define HOST_CENTRAL_MAST_NETWORKMODE_H
+
+enum NetworkMode {
+ AUTOMATIC = 2,
+ GSM_ONLY = 13,
+ LTE_ONLY = 38,
+ GSM_AND_LTE_ONLY = 51
+};
+
+#endif //HOST_CENTRAL_MAST_NETWORKMODE_H
diff --git a/host/host_central_mast/lib/TimeManager/TimeManager.h b/host/host_central_mast/lib/TimeManager/TimeManager.h
index 3079b9fc9f936154cc8205849f70b93647080baa..44b552bdf9acaae00ca5d74480454cd5fd559641 100644
--- a/host/host_central_mast/lib/TimeManager/TimeManager.h
+++ b/host/host_central_mast/lib/TimeManager/TimeManager.h
@@ -37,4 +37,4 @@ private:
};
-#endif //HOST_CENTRAL_MAST_TIMEMANAGER_H
+#endif //HOST_CENTRAL_MAST_TIMEMANAGER_H
\ No newline at end of file