Add lwip httpd examples

Fixes #266
Fixes #272

README.md

@@ -130,6 +130,7 @@ App|Description
 [picow_tls_verify](pico_w/wifi/tls_client) | Demonstrates how to make a HTTPS request using TLS with certificate verification.
 [picow_wifi_scan](pico_w/wifi/wifi_scan) | Scans for WiFi networks and prints the results.
 [picow_udp_beacon](pico_w/wifi/udp_beacon) | A simple UDP transmitter.
+[picow_httpd](pico_w/wifi/httpd) | Runs a LWIP HTTP server test app
 
 #### FreeRTOS examples
 
@@ -142,6 +143,8 @@ App|Description
 [picow_freertos_iperf_server_sys](pico_w/wifi/freertos/iperf) | Runs an "iperf" server for WiFi speed testing under FreeRTOS in NO_SYS=0 (i.e. full FreeRTOS integration) mode. The LED is blinked in another task
 [picow_freertos_ping_nosys](pico_w/wifi/freertos/ping) | Runs the lwip-contrib/apps/ping test app under FreeRTOS in NO_SYS=1 mode.
 [picow_freertos_ping_sys](pico_w/wifi/freertos/ping) | Runs the lwip-contrib/apps/ping test app under FreeRTOS in NO_SYS=0 (i.e. full FreeRTOS integration) mode. The test app uses the lwIP _socket_ API in this case.
+[pico_freertos_httpd_nosys](pico_w/wifi/freertos/httpd) | Runs a LWIP HTTP server test app under FreeRTOS in NO_SYS=1 mode.
+[pico_freertos_httpd_sys](pico_w/wifi/freertos/httpd) | Runs a LWIP HTTP server test app under FreeRTOS in NO_SYS=0 (i.e. full FreeRTOS integration) mode.
 
 ### Pico W Bluetooth
 

pico_w/wifi/CMakeLists.txt

@@ -16,6 +16,7 @@ else()
     add_subdirectory(tcp_server)
     add_subdirectory(freertos)
     add_subdirectory(udp_beacon)
+    add_subdirectory(httpd)
 
     if (NOT PICO_MBEDTLS_PATH)
         message("Skipping tls examples as PICO_MBEDTLS_PATH is not defined")

pico_w/wifi/freertos/CMakeLists.txt

@@ -5,4 +5,5 @@ else()
 
     add_subdirectory(iperf)
     add_subdirectory(ping)
+    add_subdirectory(httpd)
 endif()

pico_w/wifi/freertos/httpd/CMakeLists.txt

@@ -0,0 +1,56 @@
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_LIST_DIR})
+
+add_executable(pico_freertos_httpd_nosys
+        pico_freertos_httpd.c
+        )
+target_compile_definitions(pico_freertos_httpd_nosys PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        )
+target_include_directories(pico_freertos_httpd_nosys PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+        ${CMAKE_CURRENT_LIST_DIR}/.. # for our common FreeRTOSConfig
+        ${CMAKE_CURRENT_LIST_DIR}/../.. # for our common lwipopts
+        ${PICO_LWIP_CONTRIB_PATH}/apps/httpd
+        )
+target_link_libraries(pico_freertos_httpd_nosys
+        pico_cyw43_arch_lwip_threadsafe_background
+        pico_lwip_http
+        pico_lwip_mdns
+        pico_stdlib
+        FreeRTOS-Kernel-Heap4 # FreeRTOS kernel and dynamic heap
+        pico_freertos_httpd_content
+        )
+pico_add_extra_outputs(pico_freertos_httpd_nosys)
+
+add_executable(pico_freertos_httpd_sys
+        pico_freertos_httpd.c
+        )
+target_compile_definitions(pico_freertos_httpd_sys PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        NO_SYS=0            # don't want NO_SYS (generally this would be in your lwipopts.h)
+        LWIP_SOCKET=1       # we need the socket API (generally this would be in your lwipopts.h)
+        )
+target_include_directories(pico_freertos_httpd_sys PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+        ${CMAKE_CURRENT_LIST_DIR}/.. # for our common FreeRTOSConfig
+        ${CMAKE_CURRENT_LIST_DIR}/../.. # for our common lwipopts
+        ${PICO_LWIP_CONTRIB_PATH}/apps/httpd
+        )
+target_link_libraries(pico_freertos_httpd_sys
+        pico_cyw43_arch_lwip_sys_freertos
+        pico_lwip_http
+        pico_lwip_mdns
+        pico_stdlib
+        FreeRTOS-Kernel-Heap4 # FreeRTOS kernel and dynamic heap
+        pico_freertos_httpd_content
+        )
+pico_add_extra_outputs(pico_freertos_httpd_sys)
+
+pico_add_library(pico_freertos_httpd_content NOFLAG)
+pico_lwip_httpd_content(pico_freertos_httpd_content INTERFACE
+        ${CMAKE_CURRENT_LIST_DIR}/content/404.html
+        ${CMAKE_CURRENT_LIST_DIR}/content/index.shtml
+        ${CMAKE_CURRENT_LIST_DIR}/content/test.shtml
+        )

pico_w/wifi/freertos/httpd/FreeRTOSConfig.h

@@ -0,0 +1,7 @@
+#ifndef FREERTOS_CONFIG_H
+#define FREERTOS_CONFIG_H
+
+// This example uses a common include to avoid repetition
+#include "FreeRTOSConfig_examples_common.h"
+
+#endif

pico_w/wifi/freertos/httpd/content/404.html

@@ -0,0 +1,10 @@
+<html>
+<head>
+    <title>Pico httpd example</title>
+</head>
+<body>
+    <h1>Pico httpd example</h1>
+    <h2>404 - Page not found</h2>
+    <p>Sorry, the page you are requesting was not found on this server. </p>
+</body>
+</html>

pico_w/wifi/freertos/httpd/content/index.shtml

@@ -0,0 +1,12 @@
+<html>
+<head>
+    <title>Pico httpd example</title>
+</head>
+<body>
+    <h1>Pico httpd example</h1>
+    <p><!--#welcome--></p>
+    <p>Uptime is <!--#uptime--> seconds</p>
+    <p><a href="/?test">CGI test</a></p>
+    <p>Led is <!--#ledstate--> click <a href="/?toggleled">here</a> to toggle the led
+</body>
+</html>

pico_w/wifi/freertos/httpd/content/test.shtml

@@ -0,0 +1,11 @@
+<html>
+<head>
+    <title>Pico cgi test</title>
+</head>
+<body>
+    <h1>Pico cgi test</h1>
+    <p><table><!--#table--></table></p>
+    <p>Test result: <!--#status--></p>
+    <p><a href="/">Go back</a></p>
+</body>
+</html>

pico_w/wifi/freertos/httpd/lwipopts.h

@@ -0,0 +1,36 @@
+#ifndef _LWIPOPTS_H
+#define _LWIPOPTS_H
+
+// Generally you would define your own explicit list of lwIP options
+// (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html)
+//
+// This example uses a common include to avoid repetition
+#include "lwipopts_examples_common.h"
+
+// The following is needed to test mDns
+#define LWIP_MDNS_RESPONDER 1
+#define LWIP_IGMP 1
+#define LWIP_NUM_NETIF_CLIENT_DATA 1
+#define MDNS_RESP_USENETIF_EXTCALLBACK  1
+#define MEMP_NUM_SYS_TIMEOUT (LWIP_NUM_SYS_TIMEOUT_INTERNAL + 3)
+#define MEMP_NUM_TCP_PCB 12
+
+// Enable cgi and ssi
+#define LWIP_HTTPD_CGI 1
+#define LWIP_HTTPD_SSI 1
+#define LWIP_HTTPD_SSI_MULTIPART 1
+
+#if !NO_SYS
+#define TCPIP_THREAD_STACKSIZE 2048 // mDNS needs more stack
+#define DEFAULT_THREAD_STACKSIZE 1024
+#define DEFAULT_RAW_RECVMBOX_SIZE 8
+#define TCPIP_MBOX_SIZE 8
+#define LWIP_TIMEVAL_PRIVATE 0
+
+// not necessary, can be done either way
+#define LWIP_TCPIP_CORE_LOCKING_INPUT 1
+#endif
+
+#define HTTPD_FSDATA_FILE "pico_fsdata.inc"
+
+#endif

pico_w/wifi/freertos/httpd/pico_freertos_httpd.c

@@ -0,0 +1,217 @@
+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "pico/cyw43_arch.h"
+#include "pico/stdlib.h"
+
+#include "lwip/ip4_addr.h"
+#include "lwip/apps/mdns.h"
+#include "lwip/init.h"
+#include "lwip/apps/httpd.h"
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+void httpd_init(void);
+
+static absolute_time_t wifi_connected_time;
+static bool led_on = false;
+
+#ifndef RUN_FREERTOS_ON_CORE
+#define RUN_FREERTOS_ON_CORE 0
+#endif
+
+#define TEST_TASK_PRIORITY				( tskIDLE_PRIORITY + 1UL )
+
+#if LWIP_MDNS_RESPONDER
+static void srv_txt(struct mdns_service *service, void *txt_userdata)
+{
+  err_t res;
+  LWIP_UNUSED_ARG(txt_userdata);
+
+  res = mdns_resp_add_service_txtitem(service, "path=/", 6);
+  LWIP_ERROR("mdns add service txt failed\n", (res == ERR_OK), return);
+}
+#endif
+
+// Return some characters from the ascii representation of the mac address
+// e.g. 112233445566
+// chr_off is index of character in mac to start
+// chr_len is length of result
+// chr_off=8 and chr_len=4 would return "5566"
+// Return number of characters put into destination
+static size_t get_mac_ascii(int idx, size_t chr_off, size_t chr_len, char *dest_in) {
+    static const char hexchr[16] = "0123456789ABCDEF";
+    uint8_t mac[6];
+    char *dest = dest_in;
+    assert(chr_off + chr_len <= (2 * sizeof(mac)));
+    cyw43_hal_get_mac(idx, mac);
+    for (; chr_len && (chr_off >> 1) < sizeof(mac); ++chr_off, --chr_len) {
+        *dest++ = hexchr[mac[chr_off >> 1] >> (4 * (1 - (chr_off & 1))) & 0xf];
+    }
+    return dest - dest_in;
+}
+
+static const char *cgi_handler_test(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]) {
+    if (!strcmp(pcParam[0], "test")) {
+        return "/test.shtml";
+    } else if (strcmp(pcParam[0], "toggleled") == 0) {
+        led_on = !led_on;
+        cyw43_gpio_set(&cyw43_state, 0, led_on);
+    }
+    return "/index.shtml";
+}
+
+static tCGI cgi_handlers[] = {
+    { "/", cgi_handler_test },
+    { "/index.shtml", cgi_handler_test },
+};
+
+// Note that the buffer size is limited by LWIP_HTTPD_MAX_TAG_INSERT_LEN, so use LWIP_HTTPD_SSI_MULTIPART to return larger amounts of data
+u16_t ssi_example_ssi_handler(int iIndex, char *pcInsert, int iInsertLen
+#if LWIP_HTTPD_SSI_MULTIPART
+    , uint16_t current_tag_part, uint16_t *next_tag_part
+#endif
+) {
+    size_t printed;
+    switch (iIndex) {
+        case 0: { /* "status" */
+            printed = snprintf(pcInsert, iInsertLen, "Pass");
+            break;
+        }
+        case 1: { /* "welcome" */
+            printed = snprintf(pcInsert, iInsertLen, "Hello from Pico");
+            break;
+        }
+        case 2: { /* "uptime" */
+            uint64_t uptime_s = absolute_time_diff_us(wifi_connected_time, get_absolute_time()) / 1e6;
+            printed = snprintf(pcInsert, iInsertLen, "%"PRIu64, uptime_s);
+            break;
+        }
+        case 3: { // "ledstate"
+            printed = snprintf(pcInsert, iInsertLen, "%s", led_on ? "ON" : "OFF");
+            break;
+        }
+#if LWIP_HTTPD_SSI_MULTIPART
+        case 4: { /* "table" */
+            printed = snprintf(pcInsert, iInsertLen, "<tr><td>This is table row number %d</td></tr>", current_tag_part + 1);
+            // Leave "next_tag_part" unchanged to indicate that all data has been returned for this tag
+            if (current_tag_part < 9) {
+                *next_tag_part = current_tag_part + 1;
+            }
+            break;
+        }
+#endif
+        default: { /* unknown tag */
+            printed = 0;
+            break;
+        }
+    }
+    return (u16_t)printed;
+}
+
+// Be aware of LWIP_HTTPD_MAX_TAG_NAME_LEN
+static const char * ssi_tags[] = {
+    "status",
+    "welcome",
+    "uptime",
+    "ledstate",
+    "table",
+};
+
+void main_task(__unused void *params) {
+    if (cyw43_arch_init()) {
+        printf("failed to initialise\n");
+        return;
+    }
+
+    cyw43_arch_enable_sta_mode();
+
+    char hostname[sizeof(CYW43_HOST_NAME) + 4];
+    memcpy(&hostname[0], CYW43_HOST_NAME, sizeof(CYW43_HOST_NAME) - 1);
+    get_mac_ascii(CYW43_HAL_MAC_WLAN0, 8, 4, &hostname[sizeof(CYW43_HOST_NAME) - 1]);
+    hostname[sizeof(hostname) - 1] = '\0';
+    netif_set_hostname(&cyw43_state.netif[CYW43_ITF_STA], hostname);
+
+    printf("Connecting to WiFi...\n");
+    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
+        printf("failed to connect.\n");
+        exit(1);
+    } else {
+        printf("Connected.\n");
+    }
+
+    wifi_connected_time = get_absolute_time();
+
+#if LWIP_MDNS_RESPONDER
+    mdns_resp_init();
+    printf("mdns host name %s.local\n", hostname);
+#if LWIP_VERSION_MAJOR >= 2 && LWIP_VERSION_MINOR >= 2
+    mdns_resp_add_netif(&cyw43_state.netif[CYW43_ITF_STA], hostname);
+    mdns_resp_add_service(&cyw43_state.netif[CYW43_ITF_STA], "picow_freertos_httpd", "_http", DNSSD_PROTO_TCP, 80, srv_txt, NULL);
+#else
+    mdns_resp_add_netif(&cyw43_state.netif[CYW43_ITF_STA], hostname, 60);
+    mdns_resp_add_service(&cyw43_state.netif[CYW43_ITF_STA], "picow_freertos_httpd", "_http", DNSSD_PROTO_TCP, 80, 60, srv_txt, NULL);
+#endif
+#endif
+
+    printf("\nReady, running httpd at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    httpd_init();
+
+    http_set_cgi_handlers(cgi_handlers, LWIP_ARRAYSIZE(cgi_handlers));
+    http_set_ssi_handler(ssi_example_ssi_handler, ssi_tags, LWIP_ARRAYSIZE(ssi_tags));
+
+    while(true) {
+        vTaskDelay(100);
+    }
+
+#if LWIP_MDNS_RESPONDER
+    mdns_resp_remove_netif(&cyw43_state.netif[CYW43_ITF_STA]);
+#endif
+
+    cyw43_arch_deinit();
+}
+
+void vLaunch( void) {
+    TaskHandle_t task;
+    xTaskCreate(main_task, "TestMainThread", configMINIMAL_STACK_SIZE, NULL, TEST_TASK_PRIORITY, &task);
+
+#if NO_SYS && configUSE_CORE_AFFINITY && configNUM_CORES > 1
+    // we must bind the main task to one core (well at least while the init is called)
+    // (note we only do this in NO_SYS mode, because cyw43_arch_freertos
+    // takes care of it otherwise)
+    vTaskCoreAffinitySet(task, 1);
+#endif
+
+    /* Start the tasks and timer running. */
+    vTaskStartScheduler();
+}
+
+int main( void )
+{
+    stdio_init_all();
+
+    /* Configure the hardware ready to run the demo. */
+    const char *rtos_name;
+#if ( portSUPPORT_SMP == 1 )
+    rtos_name = "FreeRTOS SMP";
+#else
+    rtos_name = "FreeRTOS";
+#endif
+
+#if ( portSUPPORT_SMP == 1 ) && ( configNUM_CORES == 2 )
+    printf("Starting %s on both cores:\n", rtos_name);
+    vLaunch();
+#elif ( RUN_FREE_RTOS_ON_CORE == 1 )
+    printf("Starting %s on core 1:\n", rtos_name);
+    multicore_launch_core1(vLaunch);
+    while (true);
+#else
+    printf("Starting %s on core 0:\n", rtos_name);
+    vLaunch();
+#endif
+    return 0;
+}