feat(wifi_remote): Add support for simple eppp based RPC

Author: david-cermak

components/esp_wifi_remote/CMakeLists.txt

@@ -1,15 +1,20 @@
 if(NOT CONFIG_ESP_WIFI_ENABLED)
-    set(src_wifi_is_remote esp_wifi_remote.c esp_wifi_with_remote.c)
+    set(src_wifi_is_remote esp_wifi_remote.c esp_wifi_with_remote.c esp_wifi_remote_net.c)
+endif()
+
+if(CONFIG_ESP_WIFI_REMOTE_LIBRARY_EPPP)
+    set(src_wifi_remote_eppp eppp/wifi_remote_rpc_client.cpp eppp/wifi_remote_rpc_server.cpp eppp/eppp_init.c)
+else()
+    set(src_wifi_remote_weak esp_wifi_remote_weak.c)
 endif()
 
 idf_component_register(INCLUDE_DIRS include
-                    SRCS  ${src_wifi_is_remote}
-                          esp_wifi_remote_net.c
-                          esp_wifi_remote_weak.c
+                    SRCS ${src_wifi_remote_weak}
+                         ${src_wifi_remote_eppp}
+                         ${src_wifi_is_remote}
+                    PRIV_INCLUDE_DIRS eppp
                     REQUIRES esp_event esp_netif
-                    PRIV_REQUIRES esp_wifi)
-
-idf_component_optional_requires(PRIVATE esp_hosted)
+                    PRIV_REQUIRES esp_wifi esp-tls)
 
 idf_component_get_property(wifi esp_wifi COMPONENT_LIB)
 target_link_libraries(${wifi} PUBLIC ${COMPONENT_LIB})

components/esp_wifi_remote/Kconfig

@@ -5,6 +5,7 @@ menu "Wi-Fi Remote"
         default y
 
     orsource "./Kconfig.soc_wifi_caps.in"
+    orsource "./Kconfig.rpc.in"
 
         config ESP_WIFI_STATIC_RX_BUFFER_NUM
             int "Max number of WiFi static RX buffers"
@@ -191,7 +192,7 @@ menu "Wi-Fi Remote"
                 Set the size of WiFi Block Ack RX window. Generally a bigger value means higher throughput and better
                 compatibility but more memory. Most of time we should NOT change the default value unless special
                 reason, e.g. test the maximum UDP RX throughput with iperf etc. For iperf test in shieldbox, the
-                recommended value is 9~12. If PSRAM is used and WiFi memory is prefered to allocat in PSRAM first,
+                recommended value is 9~12. If PSRAM is used and WiFi memory is preferred to allocate in PSRAM first,
                 the default and minimum value should be 16 to achieve better throughput and compatibility with both
                 stations and APs.
 
@@ -228,14 +229,14 @@ menu "Wi-Fi Remote"
             help
                 ESP-MESH utilizes beacon frames to detect and resolve root node conflicts (see documentation). However
                 the default length of a beacon frame can simultaneously hold only five root node identifier structures,
-                meaning that a root node conflict of up to five nodes can be detected at one time. In the occurence of
+                meaning that a root node conflict of up to five nodes can be detected at one time. In the occurrence of
                 more root nodes conflict involving more than five root nodes, the conflict resolution process will
                 detect five of the root nodes, resolve the conflict, and re-detect more root nodes. This process will
                 repeat until all root node conflicts are resolved. However this process can generally take a very long
                 time.
 
                 To counter this situation, the beacon frame length can be increased such that more root nodes can be
-                detected simultaneously. Each additional root node will require 36 bytes and should be added ontop of
+                detected simultaneously. Each additional root node will require 36 bytes and should be added on top of
                 the default beacon frame length of
                 752 bytes. For example, if you want to detect 10 root nodes simultaneously, you need to set the beacon
                 frame length as
@@ -487,9 +488,9 @@ menu "Wi-Fi Remote"
                 help
                     Select this option to use MbedTLS TLS client for WPA2 enterprise connection.
                     Please note that from MbedTLS-3.0 onwards, MbedTLS does not support SSL-3.0
-                    TLS-v1.0, TLS-v1.1 versions. Incase your server is using one of these version,
+                    TLS-v1.0, TLS-v1.1 versions. In case your server is using one of these version,
                     it is advisable to update your server.
-                    Please disable this option for compatibilty with older TLS versions.
+                    Please disable this option for compatibility with older TLS versions.
 
             config ESP_WIFI_EAP_TLS1_3
                 bool "Enable EAP-TLS v1.3 Support for WiFi Enterprise connection"
@@ -556,6 +557,26 @@ menu "Wi-Fi Remote"
             help
                 Select this option to enable WiFi Multiband operation certification support.
 
+        config ESP_WIFI_ENABLE_ROAMING_APP
+            bool "Advanced support for Wi-Fi Roaming (Experimental)"
+            depends on IDF_EXPERIMENTAL_FEATURES
+            default n
+            select ESP_WIFI_SCAN_CACHE
+            help
+                Enable Espressif's roaming app to allow for efficient Wi-Fi roaming.
+                This includes configurable periodic environment scans, maintaining a cache of the
+                best APs, handling low rssi events etc.
+
+                Risk Warning
+                Please note that this feature is still experimental and enabling this potentially can
+                lead to unpredictable scanning, connection and roaming attempts.
+                We are still working on tuning and optimising this feature to ensure reliable and stable use.
+
+        menu "Configure roaming App"
+            depends on ESP_WIFI_ENABLE_ROAMING_APP
+            rsource "wifi_apps/roaming_app/src/Kconfig.roaming"
+        endmenu
+
         config ESP_WIFI_DPP_SUPPORT
             bool "Enable DPP support"
             default n
@@ -597,17 +618,17 @@ menu "Wi-Fi Remote"
                 default n
                 help
                     Select this option to enable validate each WPS attribute
-                    rigorously. Disabling this add the workaorunds with various APs.
+                    rigorously. Disabling this add the workarounds with various APs.
                     Enabling this may cause inter operability issues with some APs.
 
             config ESP_WIFI_WPS_PASSPHRASE
                 bool "Get WPA2 passphrase in WPS config"
                 default n
                 help
                     Select this option to get passphrase during WPS configuration.
-                    This option fakes the virtual display capabilites to get the
+                    This option fakes the virtual display capabilities to get the
                     configuration in passphrase mode.
-                    Not recommanded to be used since WPS credentials should not
+                    Not recommended to be used since WPS credentials should not
                     be shared to other devices, making it in readable format increases
                     that risk, also passphrase requires pbkdf2 to convert in psk.
 

components/esp_wifi_remote/Kconfig.rpc.in

@@ -0,0 +1,73 @@
+choice ESP_WIFI_REMOTE_LIBRARY
+    prompt "Choose WiFi-remote implementation"
+    default ESP_WIFI_REMOTE_LIBRARY_EPPP
+    help
+        Select type of WiFi Remote implementation
+
+        ESP-HOSTED is the default and most versatile option.
+        It's also possible to use EPPP, which uses PPPoS link between micros and NAPT, so it's slower
+        and less universal.
+
+    config ESP_WIFI_REMOTE_LIBRARY_HOSTED
+        bool "ESP-HOSTED"
+    config ESP_WIFI_REMOTE_LIBRARY_EPPP
+        bool "EPPP"
+endchoice
+
+    if ESP_WIFI_REMOTE_LIBRARY_EPPP
+    menu "WiFi remote by EPPP"
+
+        choice ESP_WIFI_REMOTE_EPPP_TRANSPORT
+            prompt "Choose EPPP transport"
+            default ESP_WIFI_REMOTE_EPPP_TRANSPORT_UART
+            help
+                Select type of EPPP transport
+
+            config ESP_WIFI_REMOTE_EPPP_TRANSPORT_UART
+                bool "UART"
+            config ESP_WIFI_REMOTE_EPPP_TRANSPORT_SPI
+                bool "SPI"
+        endchoice
+
+        if ESP_WIFI_REMOTE_EPPP_TRANSPORT_UART
+            config ESP_WIFI_REMOTE_EPPP_UART_TX_PIN
+                int "TXD Pin Number"
+                default 10
+                range 0 31
+                help
+                    Pin number of UART TX.
+
+            config ESP_WIFI_REMOTE_EPPP_UART_RX_PIN
+                int "RXD Pin Number"
+                default 11
+                range 0 31
+                help
+                    Pin number of UART RX.
+        endif
+
+        config ESP_WIFI_REMOTE_EPPP_SERVER_CA
+            string "Servers CA certificate"
+            default "--- Please copy content of the CA certificate ---"
+
+        config ESP_WIFI_REMOTE_EPPP_CLIENT_CRT
+            string "Client certificate"
+            default "--- Please copy content of the Client certificate ---"
+
+        config ESP_WIFI_REMOTE_EPPP_CLIENT_KEY
+            string "Client key"
+            default "--- Please copy content of the Client key ---"
+
+        config ESP_WIFI_REMOTE_EPPP_CLIENT_CA
+            string "Clients CA certificate"
+            default "--- Please copy content of the CA certificate ---"
+
+        config ESP_WIFI_REMOTE_EPPP_SERVER_CRT
+            string "Server certificate"
+            default "--- Please copy content of the Client certificate ---"
+
+        config ESP_WIFI_REMOTE_EPPP_SERVER_KEY
+            string "Server key"
+            default "--- Please copy content of the Client key ---"
+    endmenu
+
+    endif

components/esp_wifi_remote/Kconfig.soc_wifi_caps.in

@@ -227,3 +227,11 @@ endif # ESP32C6
 if SLAVE_IDF_TARGET_ESP32H2
 
 endif # ESP32H2
+
+if SLAVE_IDF_TARGET_ESP32P4
+
+    config SLAVE_SOC_WIFI_LIGHT_SLEEP_CLK_WIDTH
+        int
+        default 12
+
+endif # ESP32P4

components/esp_wifi_remote/eppp/eppp_init.c

@@ -0,0 +1,23 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "esp_log.h"
+#include "esp_wifi.h"
+#include "eppp_link.h"
+
+esp_netif_t *wifi_remote_eppp_init(eppp_type_t role)
+{
+    uint32_t our_ip = role == EPPP_SERVER ? EPPP_DEFAULT_SERVER_IP() : EPPP_DEFAULT_CLIENT_IP();
+    uint32_t their_ip = role == EPPP_SERVER ? EPPP_DEFAULT_CLIENT_IP() : EPPP_DEFAULT_SERVER_IP();
+    eppp_config_t config = EPPP_DEFAULT_CONFIG(our_ip, their_ip);
+#if CONFIG_ESP_WIFI_REMOTE_EPPP_TRANSPORT_UART
+    config.transport = EPPP_TRANSPORT_UART;
+    config.uart.tx_io = CONFIG_ESP_WIFI_REMOTE_EPPP_UART_TX_PIN;
+    config.uart.rx_io = CONFIG_ESP_WIFI_REMOTE_EPPP_UART_RX_PIN;
+#else
+#error ESP_WIFI_REMOTE supports only UART transport
+#endif
+    return eppp_open(role, &config, portMAX_DELAY);
+}