esp-modem(Docs): Update documentation and minor fixes

components/esp_modem/README.md

@@ -1,6 +1,6 @@
 # ESP MODEM
 
-The `esp-modem` component is a managed component for `esp-idf` that could be used for communication with GSM/LTE modems
+The `esp-modem` component is a managed component for `esp-idf` that is used for communication with GSM/LTE modems
 that support AT commands and PPP protocol as a network interface.
 
 ## Examples

components/esp_modem/docs/README.md

@@ -36,11 +36,11 @@ After the object is created, the application interaction with the DCE is in
 * switching between data and command mode
 
 ### DTE
-Is an abstraction of the connected interface. Current implementation supports only UART
+Is an abstraction of the physical interface connected to the modem. Current implementation supports only UART
 
-### PPP
+### PPP netif
 
-Is used to connect the specific network interface to the modem data mode. Currently implementation supports only PPPoS protocol.
+Is used to attach the specific network interface to a network communication protocol used by the modem. Currently implementation supports only PPPoS protocol.
 
 ### Module
 
@@ -48,7 +48,7 @@ Abstraction of the specific modem device. Currently the component supports SIM80
 
 ## Use cases
 
-Users could interact with the esp-modem using the DCE's interface, to basically
+Users interact with the esp-modem using the DCE's interface, to basically
 * Switch between command and data mode to connect to the internet via cellular network.
 * Send various commands to the device (e.g. send SMS)
 
@@ -57,7 +57,7 @@ IP address changes.
 
 Common use cases of the esp-modem are also listed as the examples:
 * `examples/pppos_client` -- simple client which reads some module properties and switches to the data mode to connect to a public mqtt broker.
-* `examples/modem_console` -- is an example to exercise all possible modules commands in a console application.
+* `examples/modem_console` -- is an example to exercise all possible module commands in a console application.
 * `examples/ap_to_pppos` -- this example focuses on the network connectivity of the esp-modem and provides a WiFi AP
   that forwards packets (and uses NAT) to and from the PPPoS connection.
 
@@ -66,7 +66,7 @@ Common use cases of the esp-modem are also listed as the examples:
 ### CMUX
 
 Implementation of virtual terminals is an experimental feature, which allows users to also issue commands in the data mode,
-after creating multiple virtual terminals, designating some of them solely to the data mode, while other to command mode.
+after creating multiple virtual terminals, designating some of them solely to data mode, others solely to command mode.
 
 ### DTE's
 

components/esp_modem/docs/advanced_api.rst

@@ -26,7 +26,7 @@ Create custom module
 Creating a custom module is necessary if the application needs to use a specific device that is not supported
 and their commands differ from any of the supported devices. In this case it is recommended to define a new class
 representing this specific device and derive from the :cpp:class:`GenericModule`. In order to instantiate
-the appropriate DCE of this module, application could use :ref:`the DCE factory<dce_factory>`, but build the DCE with
+the appropriate DCE of this module, application could use :ref:`the DCE factory<dce_factory>`, and build the DCE with
 the specific module, using :cpp:func:`esp_modem::dce_factory::Factory::build`.
 
 Please refer to the implementation of the existing modules.
@@ -41,7 +41,7 @@ Create new communication interface
 In order to connect to a device using an unsupported interface (e.g. SPI or I2C), it is necessary to implement
 a custom DTE object and supply it into :ref:`the DCE factory<dce_factory>`. The DCE is typically created in two steps:
 
-- Define and create the corresponding terminal, which can communicate on the custom interface. This terminal should support basic IO methods defined in :cpp:class:`esp_modem::Terminal` and derive from it.
+- Define and create the corresponding terminal, which communicates on the custom interface. This terminal should support basic IO methods defined in :cpp:class:`esp_modem::Terminal` and derive from it.
 - Create the DTE which uses the custom Terminal
 
 Please refer to the implementation of the existing UART DTE.

components/esp_modem/docs/api_docs.rst

@@ -1,15 +1,15 @@
 .. _c_api:
 
-API Guide for C interface
+C API Documentation
-=========================
+===================
 
 
-C API is very simple and consist of these two basic parts:
+The C API is very simple and consist of these two basic parts:
 
 - :ref:`lifecycle_api` 
 - :ref:`modem_commands`
 
-Typical application workflow is to:
+The Typical application workflow is to:
 
 - Create a DCE instance (using :cpp:func:`esp_modem_new`)
 - Call specific functions to issue AT commands (:ref:`modem_commands`)

components/esp_modem/docs/cxx_api_links.rst

@@ -1,25 +0,0 @@
-
-- :cpp:func:`esp_modem::DCE::sync` 
-- :cpp:func:`esp_modem::DCE::get_operator_name` 
-- :cpp:func:`esp_modem::DCE::store_profile` 
-- :cpp:func:`esp_modem::DCE::set_pin` 
-- :cpp:func:`esp_modem::DCE::read_pin` 
-- :cpp:func:`esp_modem::DCE::set_echo` 
-- :cpp:func:`esp_modem::DCE::sms_txt_mode` 
-- :cpp:func:`esp_modem::DCE::sms_character_set` 
-- :cpp:func:`esp_modem::DCE::send_sms` 
-- :cpp:func:`esp_modem::DCE::resume_data_mode` 
-- :cpp:func:`esp_modem::DCE::set_pdp_context` 
-- :cpp:func:`esp_modem::DCE::set_command_mode` 
-- :cpp:func:`esp_modem::DCE::set_cmux` 
-- :cpp:func:`esp_modem::DCE::get_imsi` 
-- :cpp:func:`esp_modem::DCE::get_imei` 
-- :cpp:func:`esp_modem::DCE::get_module_name` 
-- :cpp:func:`esp_modem::DCE::set_data_mode` 
-- :cpp:func:`esp_modem::DCE::get_signal_quality` 
-- :cpp:func:`esp_modem::DCE::set_flow_control` 
-- :cpp:func:`esp_modem::DCE::hang_up` 
-- :cpp:func:`esp_modem::DCE::get_battery_status` 
-- :cpp:func:`esp_modem::DCE::power_down` 
-- :cpp:func:`esp_modem::DCE::reset` 
-- :cpp:func:`esp_modem::DCE::set_baud`

components/esp_modem/docs/esp_modem_api_commands.h

@@ -1,99 +0,0 @@
-// cat ../include/generate/esp_modem_command_declare.inc | clang -E -P -CC  -xc -I../include -DGENERATE_DOCS  - | sed -n '1,/DCE command documentation/!p' > c_api.h
-// cat ../include/generate/esp_modem_command_declare.inc | clang -E -P  -xc -I../include -DGENERATE_DOCS -DGENERATE_RST_LINKS - | sed 's/NL/\n/g' > cxx_api_links.rst
-
-// call parametrs by names for documentation
-
-
-//  --- DCE command documentation starts here ---
-/**
- * @brief Sends the initial AT sequence to sync up with the device
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_sync (); /**
- * @brief Reads the operator name
- * @param[out] name module name
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_get_operator_name (char* name); /**
- * @brief Stores current user profile
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_store_profile (); /**
- * @brief Sets the supplied PIN code
- * @param[in] pin Pin
- * @return OK, FAIL or TIMEOUT
- */command_result esp_modem_set_pin (const char* pin); /**
- * @brief Checks if the SIM needs a PIN
- * @param[out] pin_ok true if the SIM card doesn't need a PIN to unlock
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_read_pin (bool* pin_ok); /**
- * @brief Sets echo mode
- * @param[in] echo_on true if echo mode on (repeats the commands)
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_echo (const bool echo_on); /**
- * @brief Sets the Txt or Pdu mode for SMS (only txt is supported)
- * @param[in] txt true if txt mode
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_sms_txt_mode (const bool txt); /**
- * @brief Sets the default (GSM) charater set
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_sms_character_set (); /**
- * @brief Sends SMS message in txt mode
- * @param[in] number Phone number to send the message to
- * @param[in] message Text message to be sent
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_send_sms (const char* number, const char* message); /**
- * @brief Resumes data mode (Switches back to th data mode, which was temporarily suspended)
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_resume_data_mode (); /**
- * @brief Sets php context
- * @param[in] x PdP context struct to setup modem cellular connection
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_pdp_context (struct PdpContext* x); /**
- * @brief Switches to the command mode
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_command_mode (); /**
- * @brief Switches to the CMUX mode
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_cmux (); /**
- * @brief Reads the IMSI number
- * @param[out] imsi Module's IMSI number
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_get_imsi (char* imsi); /**
- * @brief Reads the IMEI number
- * @param[out] imei Module's IMEI number
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_get_imei (char* imei); /**
- * @brief Reads the module name
- * @param[out] name module name
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_get_module_name (char* name); /**
- * @brief Sets the modem to data mode
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_data_mode (); /**
- * @brief Get Signal quality
- * @param[out] rssi signal strength indication
- * @param[out] ber channel bit error rate
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_get_signal_quality (int* rssi, int* ber); /**
- * @brief Sets HW control flow
- * @param[in] dce_flow 0=none, 2=RTS hw flow control of DCE
- * @param[in] dte_flow 0=none, 2=CTS hw flow control of DTE
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_flow_control (int dce_flow, int dte_flow); /**
- * @brief Hangs up current data call
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_hang_up (); /**
- * @brief Get voltage levels of modem power up circuitry
- * @param[out] voltage Current status in mV
- * @param[out] bcs charge status (-1-Not available, 0-Not charging, 1-Charging, 2-Charging done)
- * @param[out] bcl 1-100% battery capacity, -1-Not available
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_get_battery_status (int* voltage, int* bcs, int* bcl); /**
- * @brief Power down the module
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_power_down (); /**
- * @brief Reset the module
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_reset (); /**
- * @brief Configures the baudrate
- * @param[in] baud Desired baud rate of the DTE
- * @return OK, FAIL or TIMEOUT
- */ command_result esp_modem_set_baud (int baud);

components/esp_modem/docs/esp_modem_dce.hpp

@@ -1,111 +0,0 @@
-// cat ../include/generate/esp_modem_command_declare.inc | clang -E -P -CC  -xc -I../include -DGENERATE_DOCS  - | sed -n '1,/DCE command documentation/!p' > c_api.h
-// cat ../include/generate/esp_modem_command_declare.inc | clang -E -P  -xc -I../include -DGENERATE_DOCS -DGENERATE_RST_LINKS - | sed 's/NL/\n/g' > cxx_api_links.rst
-
-// call parametrs by names for documentation
-
-
-//  --- DCE command documentation starts here ---
-
-class esp_modem::DCE: public DCE_T<GenericModule> {
-public:
-    using DCE_T<GenericModule>::DCE_T;
-
-
-
-
-
-
-
-/**
- * @brief Sends the initial AT sequence to sync up with the device
- * @return OK, FAIL or TIMEOUT
- */ command_result sync (); /**
- * @brief Reads the operator name
- * @param[out] name module name
- * @return OK, FAIL or TIMEOUT
- */ command_result get_operator_name (std::string& name); /**
- * @brief Stores current user profile
- * @return OK, FAIL or TIMEOUT
- */ command_result store_profile (); /**
- * @brief Sets the supplied PIN code
- * @param[in] pin Pin
- * @return OK, FAIL or TIMEOUT
- */command_result set_pin (const std::string& pin); /**
- * @brief Checks if the SIM needs a PIN
- * @param[out] pin_ok true if the SIM card doesn't need a PIN to unlock
- * @return OK, FAIL or TIMEOUT
- */ command_result read_pin (bool& pin_ok); /**
- * @brief Sets echo mode
- * @param[in] echo_on true if echo mode on (repeats the commands)
- * @return OK, FAIL or TIMEOUT
- */ command_result set_echo (const bool echo_on); /**
- * @brief Sets the Txt or Pdu mode for SMS (only txt is supported)
- * @param[in] txt true if txt mode
- * @return OK, FAIL or TIMEOUT
- */ command_result sms_txt_mode (const bool txt); /**
- * @brief Sets the default (GSM) charater set
- * @return OK, FAIL or TIMEOUT
- */ command_result sms_character_set (); /**
- * @brief Sends SMS message in txt mode
- * @param[in] number Phone number to send the message to
- * @param[in] message Text message to be sent
- * @return OK, FAIL or TIMEOUT
- */ command_result send_sms (const std::string& number, const std::string& message); /**
- * @brief Resumes data mode (Switches back to th data mode, which was temporarily suspended)
- * @return OK, FAIL or TIMEOUT
- */ command_result resume_data_mode (); /**
- * @brief Sets php context
- * @param[in] x PdP context struct to setup modem cellular connection
- * @return OK, FAIL or TIMEOUT
- */ command_result set_pdp_context (PdpContext& x); /**
- * @brief Switches to the command mode
- * @return OK, FAIL or TIMEOUT
- */ command_result set_command_mode (); /**
- * @brief Switches to the CMUX mode
- * @return OK, FAIL or TIMEOUT
- */ command_result set_cmux (); /**
- * @brief Reads the IMSI number
- * @param[out] imsi Module's IMSI number
- * @return OK, FAIL or TIMEOUT
- */ command_result get_imsi (std::string& imsi); /**
- * @brief Reads the IMEI number
- * @param[out] imei Module's IMEI number
- * @return OK, FAIL or TIMEOUT
- */ command_result get_imei (std::string& imei); /**
- * @brief Reads the module name
- * @param[out] name module name
- * @return OK, FAIL or TIMEOUT
- */ command_result get_module_name (std::string& name); /**
- * @brief Sets the modem to data mode
- * @return OK, FAIL or TIMEOUT
- */ command_result set_data_mode (); /**
- * @brief Get Signal quality
- * @param[out] rssi signal strength indication
- * @param[out] ber channel bit error rate
- * @return OK, FAIL or TIMEOUT
- */ command_result get_signal_quality (int& rssi, int& ber); /**
- * @brief Sets HW control flow
- * @param[in] dce_flow 0=none, 2=RTS hw flow control of DCE
- * @param[in] dte_flow 0=none, 2=CTS hw flow control of DTE
- * @return OK, FAIL or TIMEOUT
- */ command_result set_flow_control (int dce_flow, int dte_flow); /**
- * @brief Hangs up current data call
- * @return OK, FAIL or TIMEOUT
- */ command_result hang_up (); /**
- * @brief Get voltage levels of modem power up circuitry
- * @param[out] voltage Current status in mV
- * @param[out] bcs charge status (-1-Not available, 0-Not charging, 1-Charging, 2-Charging done)
- * @param[out] bcl 1-100% battery capacity, -1-Not available
- * @return OK, FAIL or TIMEOUT
- */ command_result get_battery_status (int& voltage, int& bcs, int& bcl); /**
- * @brief Power down the module
- * @return OK, FAIL or TIMEOUT
- */ command_result power_down (); /**
- * @brief Reset the module
- * @return OK, FAIL or TIMEOUT
- */ command_result reset (); /**
- * @brief Configures the baudrate
- * @param[in] baud Desired baud rate of the DTE
- * @return OK, FAIL or TIMEOUT
- */ command_result set_baud (int baud);
-};

components/esp_modem/docs/generate_docs

@@ -19,5 +19,5 @@ doxygen
 # Generate the docs
 python -u -m sphinx.cmd.build -b html  . html
 
-# Cleanup the doxygen xml's
+# Cleanup the doxygen xml's and temporary headers
-rm -rf xml
+rm -rf xml esp_modem_api_commands.h esp_modem_dce.hpp cxx_api_links.rst

components/esp_modem/examples/ap_to_pppos/main/Kconfig.projbuild

@@ -31,9 +31,16 @@ menu "Example Configuration"
         help
             Set APN (Access Point Name), a logical name to choose data network
 
+    config EXAMPLE_NEED_SIM_PIN
+        bool "SIM PIN needed"
+        default n
+        help
+            Enable to set SIM PIN before starting the example
+
     config EXAMPLE_SIM_PIN
         string "Set SIM PIN"
         default "1234"
+        depends on EXAMPLE_NEED_SIM_PIN
         help
             Pin to unlock the SIM
 

components/esp_modem/examples/ap_to_pppos/main/ap_to_pppos.c

@@ -93,7 +93,6 @@ static void wifi_event_handler(void* arg, esp_event_base_t event_base,
 
 void wifi_init_softap(void)
 {
-
     wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
     ESP_ERROR_CHECK(esp_wifi_init(&cfg));
 

components/esp_modem/examples/ap_to_pppos/main/network_dce.cpp

@@ -19,40 +19,28 @@ using namespace esp_modem;
 using namespace esp_modem::dce_factory;
 
 class NetModule;
-typedef DCE_T<NetModule> NetDCE;
+using NetDCE = DCE_T<NetModule>;
-
-/**
- * @brief Local network object used to setup PPP network
- */
-class PPPNetwork {
-public:
-    esp_err_t init(esp_netif_t *netif, const std::string& apn, const std::string &pin_number);
-    void deinit();
-    NetDCE * get_dce();
-private:
-    NetDCE *dce;
-};
 
 /**
  * @brief The PPP network is a singleton, allocate statically here
  */
-static PPPNetwork ppp_network;
+
 
 /**
  * @brief Custom factory for creating NetDCE and NetModule
  */
 class NetDCE_Factory: public Factory {
 public:
-    template <typename T, typename ...Args>
+    template <typename Module, typename ...Args>
-    static DCE_T<T>* create(const config *cfg, Args&&... args)
+    static DCE_T<Module>* create(const config *cfg, Args&&... args)
     {
-        return build_generic_DCE<T>(cfg, std::forward<Args>(args)...);
+        return build_generic_DCE<Module>(cfg, std::forward<Args>(args)...);
     }
 
-    template <typename T, typename ...Args>
+    template <typename Module, typename ...Args>
-    static std::shared_ptr<T> create_module(const config *cfg, Args&&... args)
+    static std::shared_ptr<Module> create_module(const config *cfg, Args&&... args)
     {
-        return build_shared_module<T>(cfg, std::forward<Args>(args)...);
+        return build_shared_module<Module>(cfg, std::forward<Args>(args)...);
     }
 };
 
@@ -67,7 +55,7 @@ public:
     explicit NetModule(std::shared_ptr<DTE> dte, const esp_modem_dce_config *cfg):
             dte(std::move(dte)), apn(std::string(cfg->apn)) {}
 
-    bool setup_data_mode() override
+    [[nodiscard]] bool setup_data_mode() override
     {
         PdpContext pdp(apn);
         if (set_pdp_context(pdp) != command_result::OK)
@@ -77,18 +65,20 @@ public:
 
     bool set_mode(modem_mode mode) override
     {
-        if (mode == modem_mode::DATA_MODE) {
+        switch (mode) {
-            if (set_data_mode() != command_result::OK)
+            case esp_modem::modem_mode::DATA_MODE:
-                return resume_data_mode() == command_result::OK;
+                if (set_data_mode() != command_result::OK) {
-            return true;
+                    return resume_data_mode() == command_result::OK;
+                }
+                return true;
+            case esp_modem::modem_mode::COMMAND_MODE:
+                return set_command_mode() == command_result::OK;
+            default:
+                return false;
         }
-        if (mode == modem_mode::COMMAND_MODE) {
-            return set_command_mode() == command_result::OK;
-        }
-        return false;
     }
 
-    bool init(const std::string& pin)
+    [[maybe_unused]] bool init_sim(const std::string& pin)
     {
         // switch to command mode (in case we were in PPP mode)
         static_cast<void>(set_command_mode()); // ignore the potential failure, as we might be in command mode after startup
@@ -118,22 +108,33 @@ private:
 };
 
 
-esp_err_t PPPNetwork::init(esp_netif_t *netif, const std::string& apn, const std::string &pin_number)
+/**
+ * @brief Implement the C-API for the AP-2-PPP functionality
+ */
+namespace {
+
+/**
+ * @brief Local network object used to setup PPP network
+ */
+NetDCE *dce = nullptr;
+
+extern "C" esp_err_t modem_init_network(esp_netif_t *netif)
 {
     // configure
     esp_modem_dte_config_t dte_config = ESP_MODEM_DTE_DEFAULT_CONFIG();
     dte_config.uart_config.rx_buffer_size = 16384;
     dte_config.uart_config.tx_buffer_size = 2048;
-    esp_modem_dce_config dce_config = ESP_MODEM_DCE_DEFAULT_CONFIG(apn.c_str());
+    esp_modem_dce_config dce_config = ESP_MODEM_DCE_DEFAULT_CONFIG(CONFIG_EXAMPLE_MODEM_PPP_APN);
 
     // create DTE and minimal network DCE
     auto uart_dte = create_uart_dte(&dte_config);
 
     // create the specific device (and initialize it)
     auto dev = NetDCE_Factory::create_module<NetModule>(&dce_config, uart_dte, netif);
-    if (!dev->init(pin_number))
+#if CONFIG_EXAMPLE_NEED_SIM_PIN == 1
+    if (!dev->init_sim(CONFIG_EXAMPLE_SIM_PIN))
         return ESP_FAIL;
-
+#endif
     // now create the DCE from our already existent device
     dce = NetDCE_Factory::create<NetModule>(&dce_config, uart_dte, netif, dev);
     if (dce == nullptr)
@@ -141,36 +142,20 @@ esp_err_t PPPNetwork::init(esp_netif_t *netif, const std::string& apn, const std
     return ESP_OK;
 }
 
-void PPPNetwork::deinit()
+extern "C" void modem_start_network()
+{
+    dce->set_mode(esp_modem::modem_mode::DATA_MODE);
+}
+
+extern "C" void modem_stop_network()
+{
+    dce->set_mode(esp_modem::modem_mode::COMMAND_MODE);
+}
+
+extern "C" void modem_deinit_network()
 {
     free(dce);
     dce = nullptr;
 }
 
-NetDCE *PPPNetwork::get_dce()
+}
-{
-    return dce;
-}
-
-/**
- * @brief Implement the C-API for the AP-2-PPP functionality
- */
-extern "C" esp_err_t modem_init_network(esp_netif_t *netif)
-{
-    return ppp_network.init(netif, CONFIG_EXAMPLE_MODEM_PPP_APN, CONFIG_EXAMPLE_SIM_PIN);
-}
-
-extern "C" void modem_start_network()
-{
-    ppp_network.get_dce()->set_mode(esp_modem::modem_mode::DATA_MODE);
-}
-
-extern "C" void modem_stop_network()
-{
-    ppp_network.get_dce()->set_mode(esp_modem::modem_mode::COMMAND_MODE);
-}
-
-extern "C" void modem_deinit_network()
-{
-    ppp_network.deinit();
-}

components/esp_modem/examples/linux_modem/main/modem_main.cpp

@@ -15,7 +15,7 @@
 
 using namespace esp_modem;
 
-[[maybe_unused]] static const char *TAG = "linux_modem_main";
+[[maybe_unused]] constexpr auto TAG = "linux_modem_main";
 
 
 int main()

components/esp_modem/examples/modem_console/README.md

@@ -1,4 +1,4 @@
-# PPPoS simple client example
+# Modem console example
 
 (See the README.md file in the upper level 'examples' directory for more information about examples.)
 

components/esp_modem/examples/modem_console/main/console_helper.cpp

@@ -21,35 +21,37 @@ ConsoleCommand::ConsoleCommand(const char* command, const char* help, const std:
 void ConsoleCommand::RegisterCommand(const char* command, const char* help, const std::vector<CommandArgs>& args)
 {
     assert(last_command <= MAX_REPEAT_NR);
-    void * common_arg = nullptr;
+    arg_type common_arg = { };
-    for (auto it: args) {
+    for (auto& it: args) {
         switch(it.type) {
             case ARG_END:
                 break;
             case STR0:
-                common_arg = arg_str0(it.shortopts, it.longopts, it.datatype, it.glossary);
+                common_arg.str = arg_str0(it.shortopts, it.longopts, it.datatype, it.glossary);
                 break;
             case STR1:
-                common_arg = arg_str1(it.shortopts, it.longopts, it.datatype, it.glossary);
+                common_arg.str = arg_str1(it.shortopts, it.longopts, it.datatype, it.glossary);
                 break;
             case INT0:
-                common_arg = arg_int0(it.shortopts, it.longopts, it.datatype, it.glossary);
+                common_arg.intx = arg_int0(it.shortopts, it.longopts, it.datatype, it.glossary);
                 break;
             case INT1:
-                common_arg = arg_int1(it.shortopts, it.longopts, it.datatype, it.glossary);
+                common_arg.intx = arg_int1(it.shortopts, it.longopts, it.datatype, it.glossary);
                 break;
             case LIT0:
-                common_arg = arg_lit0(it.shortopts, it.longopts, it.glossary);
+                common_arg.lit = arg_lit0(it.shortopts, it.longopts, it.glossary);
                 break;
         }
-        if (common_arg) {
+        if (common_arg.is_null()) {
             arg_table.emplace_back(common_arg);
         } else {
             ESP_LOGE(TAG, "Creating argument parser failed for %s", it.glossary);
             abort();
         }
     }
-    arg_table.emplace_back( arg_end(1));
+
+    arg_type end = { .end = arg_end(1) };
+    arg_table.emplace_back(end);
     const esp_console_cmd_t command_def = {
             .command = command,
             .help = help,
@@ -64,13 +66,13 @@ void ConsoleCommand::RegisterCommand(const char* command, const char* help, cons
 
 int ConsoleCommand::get_count(int index)
 {
-    return ((struct arg_str *)arg_table[index])->count;
+    return (arg_table[index].str)->count;
 }
 
 std::string ConsoleCommand::get_string(int index)
 {
     if (get_count(index) > 0) {
-        return std::string(((struct arg_str *)arg_table[index])->sval[0]);
+        return std::string(arg_table[index].str->sval[0]);
     }
     return std::string();
 }
@@ -78,17 +80,17 @@ std::string ConsoleCommand::get_string(int index)
 int ConsoleCommand::get_int(int index)
 {
     if (get_count(index) > 0) {
-        return *((struct arg_int *)arg_table[index])->ival;
+        return *(arg_table[index].intx)->ival;
     }
     return -1;
 }
 
 
 int ConsoleCommand::command_func(int argc, char **argv) {
-    void * plain_arg_array = &arg_table[0];
+    arg_type* plain_arg_array = &arg_table[0];
     int nerrors = arg_parse(argc, argv, (void **)plain_arg_array);
     if (nerrors != 0) {
-        arg_print_errors(stderr, (struct arg_end *) arg_table.back(), argv[0]);
+        arg_print_errors(stderr, arg_table.back().end, argv[0]);
         return 1;
     }
     if (func) {

components/esp_modem/examples/modem_console/main/console_helper.hpp

@@ -53,6 +53,19 @@ class StaticCommands;
  * @brief This class simplifies console command definition in more object wise fashion
  */
 class ConsoleCommand {
+    /**
+     * @brief Common argument types to be stored internally for parsing later
+     */
+    using arg_type =
+    union {
+        struct arg_int *intx;
+        struct arg_str *str;
+        struct arg_lit *lit;
+        struct arg_end *end;
+        void *__raw_ptr;
+        bool is_null() const { return __raw_ptr; }
+    };
+
     friend class StaticCommands;
 public:
     /**
@@ -91,7 +104,7 @@ private:
     void RegisterCommand(const char* command, const char* help, const std::vector<CommandArgs>& args);
     template<typename T> static constexpr size_t index_arg(CommandArgs T::*member)
         { return ((uint8_t *)&((T*)nullptr->*member) - (uint8_t *)nullptr)/sizeof(CommandArgs); }
-    std::vector<void*> arg_table;
+    std::vector<arg_type> arg_table;
     int command_func(int argc, char **argv);
 
     static int last_command;

components/esp_modem/examples/modem_console/main/modem_console_main.cpp

@@ -157,11 +157,11 @@ extern "C" void app_main(void)
         auto cmd = c->get_string_of(&GenericCommandArgs::cmd);
         auto timeout = c->get_count_of(&GenericCommandArgs::timeout) ? c->get_int_of(&GenericCommandArgs::timeout)
                                                                      : 1000;
+        ESP_LOGI(TAG, "Sending command %s with timeout %d", cmd.c_str(), timeout);
         auto pattern = c->get_string_of(&GenericCommandArgs::pattern);
         if (c->get_count_of(&GenericCommandArgs::no_cr) == 0) {
             cmd += '\r';
         }
-        ESP_LOGI(TAG, "Sending command %s with timeout %d", cmd.c_str(), timeout);
         CHECK_ERR(dce->command(cmd, [&](uint8_t *data, size_t len) {
             std::string response((char *) data, len);
             ESP_LOGI(TAG, "%s", response.c_str());

components/esp_modem/include/cxx_include/esp_modem_cmux.hpp

@@ -51,7 +51,7 @@ class CMuxInstance;
 
 /**
  * @brief CMux class which consumes the original terminal and creates multiple virtual terminals from it.
- * This class is not usable applicable as a DTE terminal
+ * This class itself is not usable as a DTE terminal, only via its instances defined in `CMuxInstance`
  */
 class CMux {
 public:
@@ -100,7 +100,7 @@ public:
     void stop() override { }
 private:
     std::shared_ptr<CMux> cmux;
-    int instance;
+    size_t instance;
 };
 
 /**

components/esp_modem/include/cxx_include/esp_modem_dce.hpp

@@ -88,7 +88,7 @@ protected:
  * @brief Common abstraction of the modem DCE, specialized by the GenericModule which is a parent class for the supported
  * defices and most common modems, as well.
  */
-class DCE: public DCE_T<GenericModule> {
+class DCE : public DCE_T<GenericModule> {
 public:
 
     using DCE_T<GenericModule>::DCE_T;

components/esp_modem/include/cxx_include/esp_modem_terminal.hpp

@@ -45,7 +45,7 @@ enum class terminal_error {
 };
 
 /**
- * @brief Terminal interface. All communication interfaces must comply this interface in order to be used as a DTE
+ * @brief Terminal interface. All communication interfaces must comply to this interface in order to be used as a DTE
  */
 class Terminal {
 public:
@@ -53,7 +53,7 @@ public:
 
     void set_error_cb(std::function<void(terminal_error)> f) { on_error = std::move(f); }
 
-    virtual void set_read_cb(std::function<bool(uint8_t *data, size_t len)> f) { on_data = std::move(f); }
+    virtual void set_read_cb(std::function<bool(uint8_t *data, size_t len)> f) { on_read = std::move(f); }
 
     /**
      * @brief Writes data to the terminal
@@ -76,7 +76,7 @@ public:
     virtual void stop() = 0;
 
 protected:
-    std::function<bool(uint8_t *data, size_t len)> on_data;
+    std::function<bool(uint8_t *data, size_t len)> on_read;
     std::function<void(terminal_error)> on_error;
 };
 

components/esp_modem/include/esp_modem_config.h

@@ -17,6 +17,10 @@
 #include "driver/uart.h"
 #include "esp_modem_dce_config.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @defgroup ESP_MODEM_CONFIG
  * @brief Configuration structures for DTE and DCE
@@ -56,6 +60,9 @@ struct esp_modem_uart_term_config {
     int event_queue_size;           /*!< UART Event Queue Size, set to 0 if no event queue needed */
 };
 
+// Forward declare the resource struct
+struct esp_modem_vfs_resource;
+
 /**
  * @brief VFS configuration structure
  *
@@ -116,4 +123,8 @@ typedef struct esp_modem_dte_config esp_modem_dte_config_t;
  * @}
  */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _ESP_MODEM_CONFIG_H_

components/esp_modem/include/esp_modem_dce_config.h

@@ -15,6 +15,10 @@
 #ifndef _ESP_MODEM_DCE_CONFIG_H_
 #define _ESP_MODEM_DCE_CONFIG_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** @addtogroup ESP_MODEM_CONFIG
  * @{
  */
@@ -41,5 +45,8 @@ struct esp_modem_dce_config {
  * @}
  */
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif // _ESP_MODEM_DCE_CONFIG_H_

components/esp_modem/include/generate/esp_modem_command_declare.inc

@@ -213,7 +213,7 @@ ESP_MODEM_DECLARE_DCE_COMMAND(set_baud, command_result, 1, INT_IN(x, baud))
 #define _ARG(param, name) name
 //  --- DCE command documentation starts here ---
 #ifdef __cplusplus
-class esp_modem::DCE: public DCE_T<GenericModule> {
+class esp_modem::DCE : public DCE_T<GenericModule> {
 public:
     using DCE_T<GenericModule>::DCE_T;
 #define ESP_MODEM_DECLARE_DCE_COMMAND(name, return_type, TEMPLATE_ARG, ...) return_type name (__VA_ARGS__);

components/esp_modem/src/esp_modem_term_fs.cpp

@@ -58,7 +58,7 @@ public:
     int read(uint8_t *data, size_t len) override;
 
     void set_read_cb(std::function<bool(uint8_t *data, size_t len)> f) override {
-        on_data = std::move(f);
+        on_read = std::move(f);
         signal.set(TASK_PARAMS);
     }
 
@@ -94,7 +94,7 @@ FdTerminal::FdTerminal(const esp_modem_dte_config *config) :
 
 void FdTerminal::task()
 {
-    std::function<bool(uint8_t *data, size_t len)> on_data_priv = nullptr;
+    std::function<bool(uint8_t *data, size_t len)> on_read_priv = nullptr;
     signal.set(TASK_INIT);
     signal.wait_any(TASK_START | TASK_STOP, portMAX_DELAY);
     if (signal.is_any(TASK_STOP)) {
@@ -113,7 +113,7 @@ void FdTerminal::task()
 
         s = select(f.fd + 1, &rfds, nullptr, nullptr, &tv);
         if (signal.is_any(TASK_PARAMS)) {
-            on_data_priv = on_data;
+            on_read_priv = on_read;
             signal.clear(TASK_PARAMS);
         }
 
@@ -123,9 +123,9 @@ void FdTerminal::task()
 //            ESP_LOGV(TAG, "Select exited with timeout");
         } else {
             if (FD_ISSET(f.fd, &rfds)) {
-                if (on_data_priv) {
+                if (on_read_priv) {
-                    if (on_data_priv(nullptr, 0)) {
+                    if (on_read_priv(nullptr, 0)) {
-                        on_data_priv = nullptr;
+                        on_read_priv = nullptr;
                     }
                 }
             }

components/esp_modem/src/esp_modem_uart.cpp

@@ -65,7 +65,7 @@ public:
     int read(uint8_t *data, size_t len) override;
 
     void set_read_cb(std::function<bool(uint8_t *data, size_t len)> f) override {
-        on_data = std::move(f);
+        on_read = std::move(f);
         signal.set(TASK_PARAMS);
     }
 
@@ -106,7 +106,7 @@ std::unique_ptr<Terminal> create_uart_terminal(const esp_modem_dte_config *confi
 }
 
 void UartTerminal::task() {
-    std::function<bool(uint8_t *data, size_t len)> on_data_priv = nullptr;
+    std::function<bool(uint8_t *data, size_t len)> on_read_priv = nullptr;
     uart_event_t event;
     size_t len;
     signal.set(TASK_INIT);
@@ -117,15 +117,15 @@ void UartTerminal::task() {
     while (signal.is_any(TASK_START)) {
         if (get_event(event, 100)) {
             if (signal.is_any(TASK_PARAMS)) {
-                on_data_priv = on_data;
+                on_read_priv = on_read;
                 signal.clear(TASK_PARAMS);
             }
             switch (event.type) {
                 case UART_DATA:
                     uart_get_buffered_data_len(uart.port, &len);
-                    if (len && on_data_priv) {
+                    if (len && on_read_priv) {
-                        if (on_data_priv(nullptr, len)) {
+                        if (on_read_priv(nullptr, len)) {
-                            on_data_priv = nullptr;
+                            on_read_priv = nullptr;
                         }
                     }
                     break;