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

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;
 };