esp_modem: Moved to component folder

components/esp_modem/src/esp_modem_netif.cpp

@@ -0,0 +1,115 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <memory>
+#include <utility>
+#include <esp_log.h>
+#include <esp_event.h>
+#include "cxx_include/esp_modem_netif.hpp"
+#include "cxx_include/esp_modem_dte.hpp"
+#include "esp_netif_ppp.h"
+
+
+namespace esp_modem {
+
+void Netif::on_ppp_changed(void *arg, esp_event_base_t event_base,
+                           int32_t event_id, void *event_data) {
+    auto *ppp = static_cast<Netif *>(arg);
+    if (event_id < NETIF_PP_PHASE_OFFSET) {
+        ESP_LOGI("esp_modem_netif", "PPP state changed event %d", event_id);
+        // only notify the modem on state/error events, ignoring phase transitions
+        ppp->signal.set(PPP_EXIT);
+    }
+}
+
+esp_err_t Netif::esp_modem_dte_transmit(void *h, void *buffer, size_t len) {
+    auto *ppp = static_cast<Netif *>(h);
+    if (ppp->signal.is_any(PPP_STARTED)) {
+        if (ppp->ppp_dte && ppp->ppp_dte->write((uint8_t *) buffer, len) > 0) {
+            return ESP_OK;
+        }
+    }
+    return ESP_FAIL;
+}
+
+esp_err_t Netif::esp_modem_post_attach(esp_netif_t *esp_netif, void *args) {
+    auto d = (ppp_netif_driver *) args;
+    esp_netif_driver_ifconfig_t driver_ifconfig = {};
+    driver_ifconfig.transmit = Netif::esp_modem_dte_transmit;
+    driver_ifconfig.handle = (void *) d->ppp;
+    d->base.netif = esp_netif;
+    ESP_ERROR_CHECK(esp_netif_set_driver_config(esp_netif, &driver_ifconfig));
+    // check if PPP error events are enabled, if not, do enable the error occurred/state changed
+    // to notify the modem layer when switching modes
+    esp_netif_ppp_config_t ppp_config = { .ppp_phase_event_enabled = true,    // assuming phase enabled, as earlier IDFs
+                                          .ppp_error_event_enabled = false }; // don't provide cfg getters so we enable both events
+#if ESP_IDF_VERSION_MAJOR >= 4 && ESP_IDF_VERSION_MINOR >= 4
+    esp_netif_ppp_get_params(esp_netif, &ppp_config);
+#endif // ESP-IDF >= v4.4
+    if (!ppp_config.ppp_error_event_enabled) {
+        ppp_config.ppp_error_event_enabled = true;
+        esp_netif_ppp_set_params(esp_netif, &ppp_config);
+    }
+
+    return ESP_OK;
+}
+
+void Netif::receive(uint8_t *data, size_t len) {
+    if (signal.is_any(PPP_STARTED)) {
+        esp_netif_receive(driver.base.netif, data, len, nullptr);
+    }
+}
+
+Netif::Netif(std::shared_ptr<DTE> e, esp_netif_t *ppp_netif) :
+        ppp_dte(std::move(e)), netif(ppp_netif) {
+    driver.base.netif = ppp_netif;
+    driver.ppp = this;
+    driver.base.post_attach = esp_modem_post_attach;
+    throw_if_esp_fail(esp_event_handler_register(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, &on_ppp_changed, (void *) this));
+    throw_if_esp_fail(esp_event_handler_register(IP_EVENT, IP_EVENT_PPP_GOT_IP, esp_netif_action_connected, ppp_netif));
+    throw_if_esp_fail(
+            esp_event_handler_register(IP_EVENT, IP_EVENT_PPP_LOST_IP, esp_netif_action_disconnected, ppp_netif));
+    throw_if_esp_fail(esp_netif_attach(ppp_netif, &driver));
+}
+
+void Netif::start() {
+    ppp_dte->set_read_cb([this](uint8_t *data, size_t len) -> bool {
+        receive(data, len);
+        return false;
+    });
+    esp_netif_action_start(driver.base.netif, nullptr, 0, nullptr);
+    signal.set(PPP_STARTED);
+}
+
+void Netif::stop() {
+    esp_netif_action_stop(driver.base.netif, nullptr, 0, nullptr);
+    signal.clear(PPP_STARTED);
+}
+
+Netif::~Netif() {
+    if (signal.is_any(PPP_STARTED)) {
+        esp_netif_action_stop(driver.base.netif, nullptr, 0, nullptr);
+        signal.clear(PPP_STARTED);
+        signal.wait(PPP_EXIT, 30000);
+    }
+    esp_event_handler_unregister(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, &on_ppp_changed);
+    esp_event_handler_unregister(IP_EVENT, IP_EVENT_PPP_GOT_IP, esp_netif_action_connected);
+    esp_event_handler_unregister(IP_EVENT, IP_EVENT_PPP_LOST_IP, esp_netif_action_disconnected);
+}
+
+void Netif::wait_until_ppp_exits() {
+    signal.wait(PPP_EXIT, 30000);
+}
+
+} // namespace esp_modem