tests/nanocoap_fs: add test for nanoCoAP fs

tests/net/nanocoap_fs/Makefile

@@ -0,0 +1,22 @@
+include ../Makefile.net_common
+
+# Include packages that pull up and auto-init the link layer.
+# NOTE: 6LoWPAN will be included if IEEE802.15.4 devices are present
+USEMODULE += netdev_default
+USEMODULE += auto_init_gnrc_netif
+# Specify the mandatory networking modules
+USEMODULE += gnrc_ipv6_default
+
+# Optionally include DNS support. This includes resolution of names at an
+# upstream DNS server and the handling of RDNSS options in Router Advertisements
+# to auto-configure that upstream DNS server.
+# USEMODULE += sock_dns              # include DNS client
+# USEMODULE += gnrc_ipv6_nib_dns     # include RDNSS option handling
+
+USEMODULE += nanocoap_fs
+
+# Required by test
+USEMODULE += shell
+USEMODULE += shell_cmds_default
+
+include $(RIOTBASE)/Makefile.include

tests/net/nanocoap_fs/Makefile.ci

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+BOARD_INSUFFICIENT_MEMORY := \
+    arduino-duemilanove \
+    arduino-leonardo \
+    arduino-mega2560 \
+    arduino-nano \
+    arduino-uno \
+    atmega328p \
+    atmega328p-xplained-mini \
+    atmega8 \
+    atxmega-a3bu-xplained \
+    bluepill-stm32f030c8 \
+    i-nucleo-lrwan1 \
+    msb-430 \
+    msb-430h \
+    nucleo-c031c6 \
+    nucleo-f030r8 \
+    nucleo-f031k6 \
+    nucleo-f042k6 \
+    nucleo-f303k8 \
+    nucleo-f334r8 \
+    nucleo-l011k4 \
+    nucleo-l031k6 \
+    nucleo-l053r8 \
+    olimex-msp430-h1611 \
+    olimex-msp430-h2618 \
+    samd10-xmini \
+    slstk3400a \
+    stk3200 \
+    stm32f030f4-demo \
+    stm32f0discovery \
+    stm32f7508-dk \
+    stm32g0316-disco \
+    stm32l0538-disco \
+    telosb \
+    waspmote-pro \
+    weact-g030f6 \
+    z1 \
+    #

tests/net/nanocoap_fs/README.md

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+# nanoCoAP remote fs example
+
+This allows to mount a remote fs that was exported via e.g. `nanocoap_fileserver`
+or `aiocoap-fileserver`.
+
+The test provides a `mount` command to mount a remote fs at a local mount point:
+
+    mount coap://[fe80::607f:b1ff:fef7:689c]/vfs /coap
+
+This will mount the `vfs/` resource on the remote server as a local `/coap/`
+directory. This can then be interacted with normal `vfs` commands such as `ls`.

tests/net/nanocoap_fs/main.c

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+/*
+ * Copyright (c) 2024 ML!PA Consulting GmbH
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       nanoCoAP fs test app
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include "msg.h"
+
+#include "net/nanocoap/fs.h"
+#include "string_utils.h"
+#include "shell.h"
+
+#define MAIN_QUEUE_SIZE (4)
+static msg_t _main_msg_queue[MAIN_QUEUE_SIZE];
+
+static int _cmd_mount(int argc, char **argv)
+{
+    static char url[64];
+    static char mp[64];
+    int res;
+
+    if (argc != 3) {
+        printf("usage: %s <url> <path>\n", argv[0]);
+        return 1;
+    }
+
+    if ((res = strscpy(mp, argv[2], sizeof(mp))) < 0) {
+        return res;
+    }
+    if ((res = strscpy(url, argv[1], sizeof(url))) < 0) {
+        return res;
+    }
+
+    if (url[res] != '/') {
+        url[res] = '/';
+        if (res == sizeof(url)) {
+            return -ENOBUFS;
+        }
+        url[++res] = 0;
+    }
+
+    static nanocoap_fs_t nanocoap_fs_desc = {
+        .url = url,
+    };
+
+    static vfs_mount_t _mount = {
+        .fs = &nanocoap_fs_file_system,
+        .mount_point = mp,
+        .private_data = &nanocoap_fs_desc,
+    };
+
+    res = vfs_mount(&_mount);
+
+    return res;
+}
+
+static const shell_command_t shell_commands[] = {
+    { "mount", "Mount a remote fs", _cmd_mount },
+    { NULL, NULL, NULL }
+};
+
+int main(void)
+{
+    /* for the thread running the shell */
+    msg_init_queue(_main_msg_queue, MAIN_QUEUE_SIZE);
+
+    /* start shell */
+    puts("All up, running the shell now");
+    char line_buf[SHELL_DEFAULT_BUFSIZE];
+    shell_run(shell_commands, line_buf, SHELL_DEFAULT_BUFSIZE);
+
+    /* should never be reached */
+    return 0;
+}