Implement perfect forwarding for command lib

esp_modem/src/esp_modem_netif.cpp

@@ -0,0 +1,104 @@
+//
+// Created by david on 2/26/21.
+//
+#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"
+
+#include <iostream>
+
+
+void PPP::on_ppp_changed(void *arg, esp_event_base_t event_base,
+                           int32_t event_id, void *event_data)
+{
+    PPP *ppp = (PPP*)arg;
+//    DTE *e = (DTE*)arg;
+    std::cout << "on_ppp_changed " << std::endl;
+    ESP_LOGW("TAG", "PPP state changed event %d", event_id);
+    if (event_id < NETIF_PP_PHASE_OFFSET) {
+        ESP_LOGI("TAG", "PPP state changed event %d", event_id);
+        // only notify the modem on state/error events, ignoring phase transitions
+        ppp->signal.set(PPP_EXIT);
+//        e->notify_ppp_exit();
+//        e->data_mode_closed();
+//        esp_modem_notify_ppp_netif_closed(dte);
+    }
+}
+
+esp_err_t PPP::esp_modem_dte_transmit(void *h, void *buffer, size_t len)
+{
+    PPP *ppp = (PPP*)h;
+    if (ppp->signal.is_any(PPP_STARTED)) {
+        std::cout << "sending data " << len << std::endl;
+        if (ppp->ppp_dte->write((uint8_t*)buffer, len) > 0) {
+            return ESP_OK;
+        }
+    }
+    return ESP_FAIL;
+}
+
+esp_err_t PPP::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 = PPP::esp_modem_dte_transmit;
+    driver_ifconfig.handle = (void*)d->ppp;
+    std::cout << "esp_modem_post_attach " << std::endl;
+    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;
+    esp_netif_ppp_get_params(esp_netif, &ppp_config);
+    if (!ppp_config.ppp_error_event_enabled) {
+        ppp_config.ppp_error_event_enabled = true;
+        esp_netif_ppp_set_params(esp_netif, &ppp_config);
+    }
+
+//    ESP_ERROR_CHECK(esp_event_handler_register(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, &on_ppp_changed, 0));
+    return ESP_OK;
+}
+
+void PPP::receive(uint8_t *data, size_t len)
+{
+    if (signal.is_any(PPP_STARTED)) {
+        std::cout << "received data " << len << std::endl;
+        esp_netif_receive(driver.base.netif, data, len, nullptr);
+    }
+}
+
+PPP::PPP(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 PPP::start()
+{
+    ppp_dte->set_data_cb([this](size_t len) -> bool {
+        uint8_t *data;
+        auto actual_len = ppp_dte->read(&data, len);
+        receive(data, actual_len);
+        return false;
+    });
+    esp_netif_action_start(driver.base.netif, 0, 0, 0);
+    signal.set(PPP_STARTED);
+}
+
+void PPP::stop()
+{
+    std::cout << "esp_netif_action_stop "  << std::endl;
+    esp_netif_action_stop(driver.base.netif, nullptr, 0, nullptr);
+    signal.clear(PPP_STARTED);
+
+}