Merge pull request #1524 from zudwalex/zephyr2

Add Zephyr examples
2024-12-27 15:01:03 +08:00 · 2022-04-13 11:17:22 +01:00 · 2022-04-13 11:17:22 +01:00 · d630ba743d
commit d630ba743d
parent e9fabdcc96 17e0fb1c15
21 changed files with 757 additions and 19 deletions
--- a/examples/zephyr/Makefile
+++ b/examples/zephyr/Makefile
@ -1,15 +0,0 @@
-CWD = $(realpath $(CURDIR))
-ZEPHYR_DIR ?= $(realpath ../../../zephyrproject)
-
-example:
-	true
-
-build:
-	cp ../../mongoose.c ../../mongoose.h http-server/src/
-	cd $(ZEPHYR_DIR) && west build -b nucleo_f746zg -p auto $(CWD)/http-server
-
-flash:
-	cd $(ZEPHYR_DIR) && west flash
-
-clean:
-	rm -rf */*/mongoose.*
--- a/examples/zephyr/http-client/CMakeLists.txt
+++ b/examples/zephyr/http-client/CMakeLists.txt
@ -0,0 +1,11 @@
+# Copyright (c) 2022 Cesanta Software Limited
+# Mail: support@cesanta.com
+#
+# SPDX-License-Identifier: GPL2.0 or commercial
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(http_server)
+#add_definitions(-DMG_ENABLE_LINES=1)
+add_definitions(-DMG_ENABLE_MBEDTLS=1 -DMG_MBEDTLS_DEBUG_LEVEL=4)
+target_sources(app PRIVATE src/main.c src/mongoose.c)
--- a/examples/zephyr/http-client/Makefile
+++ b/examples/zephyr/http-client/Makefile
@ -0,0 +1,16 @@
+CWD = $(realpath $(CURDIR))
+ZEPHYR_DIR ?= $(realpath ../../../../zephyrproject)
+BOARD ?= nucleo_h743zi
+
+example:
+	true
+
+build:
+	cp ../../../mongoose.c ../../../mongoose.h src/
+	cd $(ZEPHYR_DIR) && west build -b $(BOARD) -p auto $(CWD)
+
+flash:
+	cd $(ZEPHYR_DIR) && west flash
+
+clean:
+	rm -rf */*/mongoose.*
--- a/examples/zephyr/http-client/prj.conf
+++ b/examples/zephyr/http-client/prj.conf
@ -0,0 +1,32 @@
+CONFIG_NETWORKING=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_TCP=y
+CONFIG_NET_UDP=y
+CONFIG_NET_DHCPV4=y
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_POLL_MAX=32
+CONFIG_POSIX_MAX_FDS=32
+CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_NET_LOG=y
+
+CONFIG_LOG=y
+CONFIG_ISR_STACK_SIZE=2048
+CONFIG_MAIN_STACK_SIZE=16000
+CONFIG_IDLE_STACK_SIZE=1024
+
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=8192
+CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
+CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED=y
+CONFIG_MBEDTLS_ECP_ALL_ENABLED=y
+CONFIG_MBEDTLS_TLS_VERSION_1_2=y
+
+CONFIG_MINIMAL_LIBC_RAND=y
+CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE=131072
+
+CONFIG_FILE_SYSTEM_LITTLEFS=y
+
+CONFIG_PRINTK=y
+CONFIG_MBEDTLS_DEBUG=y
+CONFIG_MBEDTLS_DEBUG_LEVEL=4
--- a/examples/zephyr/http-client/src/certs.h
+++ b/examples/zephyr/http-client/src/certs.h
@ -0,0 +1,87 @@
+#ifndef CERTS_H_
+#define CERTS_H_
+
+static const char *s_ca =
+"-\n"
+"Subject: C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert High Assurance EV Root CA\n"
+"Not Before: Nov 10 00:00:00 2006 GMT\n"
+"Not After : Nov 10 00:00:00 2031 GMT\n"
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs\n"
+"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n"
+"d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j\n"
+"ZSBFViBSb290IENBMB4XDTA2MTExMDAwMDAwMFoXDTMxMTExMDAwMDAwMFowbDEL\n"
+"MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3\n"
+"LmRpZ2ljZXJ0LmNvbTErMCkGA1UEAxMiRGlnaUNlcnQgSGlnaCBBc3N1cmFuY2Ug\n"
+"RVYgUm9vdCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMbM5XPm\n"
+"+9S75S0tMqbf5YE/yc0lSbZxKsPVlDRnogocsF9ppkCxxLeyj9CYpKlBWTrT3JTW\n"
+"PNt0OKRKzE0lgvdKpVMSOO7zSW1xkX5jtqumX8OkhPhPYlG++MXs2ziS4wblCJEM\n"
+"xChBVfvLWokVfnHoNb9Ncgk9vjo4UFt3MRuNs8ckRZqnrG0AFFoEt7oT61EKmEFB\n"
+"Ik5lYYeBQVCmeVyJ3hlKV9Uu5l0cUyx+mM0aBhakaHPQNAQTXKFx01p8VdteZOE3\n"
+"hzBWBOURtCmAEvF5OYiiAhF8J2a3iLd48soKqDirCmTCv2ZdlYTBoSUeh10aUAsg\n"
+"EsxBu24LUTi4S8sCAwEAAaNjMGEwDgYDVR0PAQH/BAQDAgGGMA8GA1UdEwEB/wQF\n"
+"MAMBAf8wHQYDVR0OBBYEFLE+w2kD+L9HAdSYJhoIAu9jZCvDMB8GA1UdIwQYMBaA\n"
+"FLE+w2kD+L9HAdSYJhoIAu9jZCvDMA0GCSqGSIb3DQEBBQUAA4IBAQAcGgaX3Nec\n"
+"nzyIZgYIVyHbIUf4KmeqvxgydkAQV8GK83rZEWWONfqe/EW1ntlMMUu4kehDLI6z\n"
+"eM7b41N5cdblIZQB2lWHmiRk9opmzN6cN82oNLFpmyPInngiK3BD41VHMWEZ71jF\n"
+"hS9OMPagMRYjyOfiZRYzy78aG6A9+MpeizGLYAiJLQwGXFK3xPkKmNEVX58Svnw2\n"
+"Yzi9RKR/5CYrCsSXaQ3pjOLAEFe4yHYSkVXySGnYvCoCWw9E1CAx2/S6cCZdkGCe\n"
+"vEsXCS+0yx5DaMkHJ8HSXPfqIbloEpw8nL+e/IBcm2PN7EeqJSdnoDfzAIJ9VNep\n"
+"+OkuE6N36B9K\n"
+"-----END CERTIFICATE-----\n"
+"\n"
+"Subject: C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert Global Root CA\n"
+"Not Before: Nov 10 00:00:00 2006 GMT\n"
+"Not After : Nov 10 00:00:00 2031 GMT\n"
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n"
+"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n"
+"d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n"
+"QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n"
+"MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n"
+"b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n"
+"9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n"
+"CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n"
+"nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n"
+"43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n"
+"T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n"
+"gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n"
+"BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n"
+"TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n"
+"DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n"
+"hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n"
+"06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n"
+"PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n"
+"YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n"
+"CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n"
+"-----END CERTIFICATE-----\n"
+"\n"
+"Not Before: Nov 10 00:00:00 2006 GMT\n"
+"Not After : Nov 10 00:00:00 2031 GMT\n"
+"Subject: C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root CA\n"
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n"
+"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n"
+"d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n"
+"QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n"
+"MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n"
+"b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n"
+"9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n"
+"CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n"
+"nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n"
+"43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n"
+"T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n"
+"gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n"
+"BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n"
+"TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n"
+"DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n"
+"hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n"
+"06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n"
+"PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n"
+"YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n"
+"CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n"
+"-----END CERTIFICATE-----\n"
+"\n"
+"";
+
+#endif
--- a/examples/zephyr/http-client/src/main.c
+++ b/examples/zephyr/http-client/src/main.c
@ -0,0 +1,112 @@
+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+#include "certs.h"
+
+static const char *s_debug_level = "3";
+static time_t s_boot_timestamp = 0;
+static struct mg_connection *s_sntp_conn = NULL;
+static const char *s_url = "https://example.org/";
+static const char *s_post_data = NULL;     // POST data
+static const int64_t s_timeout_ms = 1500;  // Connect timeout in milliseconds
+struct mg_mgr s_mgr;
+static int s_connected = 0;
+
+// Print HTTP response and signal that we're done
+static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_OPEN) {
+    // Connection created. Store connect expiration time in c->label
+    *(int64_t *) c->label = mg_millis() + s_timeout_ms;
+  } else if (ev == MG_EV_POLL) {
+    if (mg_millis() > *(int64_t *) c->label &&
+        (c->is_connecting || c->is_resolving)) {
+      mg_error(c, "Connect timeout");
+    }
+  } else if (ev == MG_EV_CONNECT) {
+    // Connected to server. Extract host name from URL
+    struct mg_str host = mg_url_host(s_url);
+
+    // If s_url is https://, tell client connection to use TLS
+    if (mg_url_is_ssl(s_url)) {
+      struct mg_tls_opts opts = {.ca = s_ca, .srvname = host };
+      mg_tls_init(c, &opts);
+    }
+
+    // Send request
+    int content_length = s_post_data ? strlen(s_post_data) : 0;
+    mg_printf(c,
+              "%s %s HTTP/1.0\r\n"
+              "Host: %.*s\r\n"
+              "Content-Type: octet-stream\r\n"
+              "Content-Length: %d\r\n"
+              "\r\n",
+              s_post_data ? "POST" : "GET", mg_url_uri(s_url), (int) host.len,
+              host.ptr, content_length);
+    mg_send(c, s_post_data, content_length);
+  } else if (ev == MG_EV_HTTP_MSG) {
+    // Response is received. Print it
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    MG_INFO(("%.*s", (int) hm->message.len, hm->message.ptr));
+    c->is_closing = 1;         // Tell mongoose to close this connection
+    *(bool *) fn_data = true;  // Tell event loop to stop
+  } else if (ev == MG_EV_ERROR) {
+    *(bool *) fn_data = true;  // Error, tell event loop to stop
+  }
+}
+
+// We have no valid system time(), and we need it for TLS. Implement it
+time_t time(time_t *tp) {
+  time_t t = s_boot_timestamp + k_uptime_get() / 1000;
+  if (tp != NULL) *tp = t;
+  return t;
+}
+
+// SNTP callback. Modifies s_boot_timestamp, to make time() correct
+static void sfn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_SNTP_TIME) {
+    int64_t t = *(int64_t *) ev_data;
+    MG_INFO(("Got SNTP time: %lld ms from epoch", t));
+    s_boot_timestamp = (time_t) ((t - mg_millis()) / 1000);
+
+    // We need correct time in order to get HTTPs working, therefore,
+    // making https request from SMTP callback
+    if(!s_connected) {
+      MG_INFO(("Connecting to    : [%s]", s_url));
+      mg_http_connect(&s_mgr, s_url, fn, NULL);  // Create client connection
+      s_connected = 1;
+    }
+  } else if (ev == MG_EV_CLOSE) {
+    s_sntp_conn = NULL;
+  }
+}
+
+// Periodic timer syncs time via SNTP
+static void timer_fn(void *arg) {
+  struct mg_mgr *mgr = (struct mg_mgr *) arg;
+  if (s_sntp_conn == NULL) s_sntp_conn = mg_sntp_connect(mgr, NULL, sfn, NULL);
+  if (s_boot_timestamp < 9999) mg_sntp_send(s_sntp_conn, time(NULL));
+}
+
+// Use Zephyr's printk() for Mongooose MG_* logging
+static void logfn(const void *ptr, size_t len, void *userdata) {
+  printk("%.*s", (int) len, (char *) ptr);
+}
+
+int main(int argc, char *argv[]) {
+  mg_log_set(s_debug_level);
+  mg_log_set_callback(logfn, NULL);
+
+  mg_mgr_init(&s_mgr);
+
+  struct mg_timer t;
+  mg_timer_init(&t, 5000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, timer_fn, &s_mgr);
+
+  // Start infinite event loop
+  MG_INFO(("Mongoose version : v%s", MG_VERSION));
+
+  for (;;) mg_mgr_poll(&s_mgr, 1000);
+  mg_mgr_free(&s_mgr);
+
+  return 0;
+}
--- a/examples/zephyr/http-server/CMakeLists.txt
+++ b/examples/zephyr/http-server/CMakeLists.txt
@ -6,6 +6,5 @@
 cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(http_server)
-#add_definitions(-DMG_ENABLE_LINES=1)
 add_definitions(-DMG_ENABLE_MBEDTLS=1)
 target_sources(app PRIVATE src/main.c src/mongoose.c)
--- a/examples/zephyr/http-server/Makefile
+++ b/examples/zephyr/http-server/Makefile
@ -0,0 +1,16 @@
+CWD = $(realpath $(CURDIR))
+ZEPHYR_DIR ?= $(realpath ../../../../zephyrproject)
+BOARD ?= nucleo_h743zi
+
+example:
+	true
+
+build:
+	cp ../../../mongoose.c ../../../mongoose.h src/
+	cd $(ZEPHYR_DIR) && west build -b $(BOARD) -p auto $(CWD)
+
+flash:
+	cd $(ZEPHYR_DIR) && west flash
+
+clean:
+	rm -rf */*/mongoose.*
--- a/examples/zephyr/http-server/prj.conf
+++ b/examples/zephyr/http-server/prj.conf
@ -6,6 +6,7 @@ CONFIG_NET_UDP=y
 CONFIG_NET_DHCPV4=y
 CONFIG_NET_SOCKETS=y
 CONFIG_NET_SOCKETS_POLL_MAX=32
+CONFIG_POSIX_MAX_FDS=32
 CONFIG_NET_CONFIG_SETTINGS=y
 CONFIG_NET_LOG=y

@ -16,6 +17,9 @@ CONFIG_IDLE_STACK_SIZE=1024

 CONFIG_MBEDTLS=y
 CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=2048
+CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
+CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED=y
+CONFIG_MBEDTLS_ECP_ALL_ENABLED=y

 CONFIG_MINIMAL_LIBC_RAND=y
 CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE=32756
--- a/examples/zephyr/http-server/src/certs.h
+++ b/examples/zephyr/http-server/src/certs.h
@ -0,0 +1,24 @@
+#ifndef CERTS_H_
+#define CERTS_H_
+
+static const char *s_ssl_cert =
+"-----BEGIN CERTIFICATE-----\r\n"                                       \
+"MIIBhzCCASygAwIBAgIUbnMoVd8TtWH1T09dANkK2LU6IUswCgYIKoZIzj0EAwIw\r\n"  \
+"RDELMAkGA1UEBhMCSUUxDzANBgNVBAcMBkR1YmxpbjEQMA4GA1UECgwHQ2VzYW50\r\n"  \
+"YTESMBAGA1UEAwwJVGVzdCBSb290MB4XDTIwMDUwOTIxNTE0OVoXDTMwMDUwOTIx\r\n"  \
+"NTE0OVowETEPMA0GA1UEAwwGc2VydmVyMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcD\r\n"  \
+"QgAEkuBGnInDN6l06zVVQ1VcrOvH5FDu9MC6FwJc2e201P8hEpq0Q/SJS2nkbSuW\r\n"  \
+"H/wBTTBaeXN2uhlBzMUWK790KKMvMC0wCQYDVR0TBAIwADALBgNVHQ8EBAMCA6gw\r\n"  \
+"EwYDVR0lBAwwCgYIKwYBBQUHAwEwCgYIKoZIzj0EAwIDSQAwRgIhAPo6xx7LjCdZ\r\n"  \
+"QY133XvLjAgVFrlucOZHONFVQuDXZsjwAiEAzHBNligA08c5U3SySYcnkhurGg50\r\n"  \
+"BllCI0eYQ9ggp/o=\r\n"                                                  \
+"-----END CERTIFICATE-----\r\n";
+
+static const char *s_ssl_key =
+"-----BEGIN PRIVATE KEY-----\r\n"                                       \
+"MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQglNni0t9Dg9icgG8w\r\n"  \
+"kbfxWSS+TuNgbtNybIQXcm3NHpmhRANCAASS4EacicM3qXTrNVVDVVys68fkUO70\r\n"  \
+"wLoXAlzZ7bTU/yESmrRD9IlLaeRtK5Yf/AFNMFp5c3a6GUHMxRYrv3Qo\r\n"          \
+"-----END PRIVATE KEY-----\r\n";
+
+#endif
--- a/examples/zephyr/http-server/src/main.c
+++ b/examples/zephyr/http-server/src/main.c
@ -2,20 +2,19 @@
 // All rights reserved

 #include "mongoose.h"
+#include "certs.h"

 static const char *s_debug_level = "3";
 static const char *s_web_dir = "/";
 static const char *s_http_addr = "http://0.0.0.0:8000";
 static const char *s_https_addr = "https://0.0.0.0:8443";
-static const char *s_cert = "cert.pem";
-static const char *s_key = "key.pem";
 static time_t s_boot_timestamp = 0;
 static struct mg_connection *s_sntp_conn = NULL;

 // Event handler for the listening HTTP/HTTPS connection.
 static void wcb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
  if (ev == MG_EV_ACCEPT && fn_data != NULL) {
-    struct mg_tls_opts opts = {.cert = s_cert, .certkey = s_key};
+    struct mg_tls_opts opts = {.cert = s_ssl_cert, .certkey = s_ssl_key};
    mg_tls_init(c, &opts);
  } else if (ev == MG_EV_HTTP_MSG) {
    struct mg_http_message *hm = ev_data;
--- a/examples/zephyr/mqtt-client-aws-client/CMakeLists.txt
+++ b/examples/zephyr/mqtt-client-aws-client/CMakeLists.txt
@ -0,0 +1,11 @@
+# Copyright (c) 2022 Cesanta Software Limited
+# Mail: support@cesanta.com
+#
+# SPDX-License-Identifier: GPL2.0 or commercial
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(http_server)
+#add_definitions(-DMG_ENABLE_LINES=1)
+add_definitions(-DMG_ENABLE_MBEDTLS=1 -DMG_MBEDTLS_DEBUG_LEVEL=4)
+target_sources(app PRIVATE src/main.c src/mongoose.c)
--- a/examples/zephyr/mqtt-client-aws-client/Makefile
+++ b/examples/zephyr/mqtt-client-aws-client/Makefile
@ -0,0 +1,16 @@
+CWD = $(realpath $(CURDIR))
+ZEPHYR_DIR ?= $(realpath ../../../../zephyrproject)
+BOARD ?= nucleo_h743zi
+
+example:
+	true
+
+build:
+	cp ../../../mongoose.c ../../../mongoose.h src/
+	cd $(ZEPHYR_DIR) && west build -b $(BOARD) -p auto $(CWD)
+
+flash:
+	cd $(ZEPHYR_DIR) && west flash
+
+clean:
+	rm -rf */*/mongoose.*
--- a/examples/zephyr/mqtt-client-aws-client/prj.conf
+++ b/examples/zephyr/mqtt-client-aws-client/prj.conf
@ -0,0 +1,32 @@
+CONFIG_NETWORKING=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_TCP=y
+CONFIG_NET_UDP=y
+CONFIG_NET_DHCPV4=y
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_POLL_MAX=32
+CONFIG_POSIX_MAX_FDS=32
+CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_NET_LOG=y
+
+CONFIG_LOG=y
+CONFIG_ISR_STACK_SIZE=2048
+CONFIG_MAIN_STACK_SIZE=16000
+CONFIG_IDLE_STACK_SIZE=1024
+
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=8192
+CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
+CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED=y
+CONFIG_MBEDTLS_ECP_ALL_ENABLED=y
+CONFIG_MBEDTLS_TLS_VERSION_1_2=y
+
+CONFIG_MINIMAL_LIBC_RAND=y
+CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE=131072
+
+CONFIG_FILE_SYSTEM_LITTLEFS=y
+
+CONFIG_PRINTK=y
+CONFIG_MBEDTLS_DEBUG=y
+CONFIG_MBEDTLS_DEBUG_LEVEL=4
--- a/examples/zephyr/mqtt-client-aws-client/src/certs.h
+++ b/examples/zephyr/mqtt-client-aws-client/src/certs.h
@ -0,0 +1,115 @@
+#ifndef CERTS_H_
+#define CERTS_H_
+
+static const char *s_ca =
+"-\n"
+"# Note: Amazon ATS endpoint uses this (2018/12/18)\n"
+"Subject: C=US, O=Starfield Technologies, Inc., OU=Starfield Class 2 Certification Authority\n"
+"Not Before: Jun 29 17:39:16 2004 GMT\n"
+"Not After : Jun 29 17:39:16 2034 GMT\n"
+"-----BEGIN CERTIFICATE-----\n"
+"MIIEDzCCAvegAwIBAgIBADANBgkqhkiG9w0BAQUFADBoMQswCQYDVQQGEwJVUzEl\n"
+"MCMGA1UEChMcU3RhcmZpZWxkIFRlY2hub2xvZ2llcywgSW5jLjEyMDAGA1UECxMp\n"
+"U3RhcmZpZWxkIENsYXNzIDIgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwHhcNMDQw\n"
+"NjI5MTczOTE2WhcNMzQwNjI5MTczOTE2WjBoMQswCQYDVQQGEwJVUzElMCMGA1UE\n"
+"ChMcU3RhcmZpZWxkIFRlY2hub2xvZ2llcywgSW5jLjEyMDAGA1UECxMpU3RhcmZp\n"
+"ZWxkIENsYXNzIDIgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwggEgMA0GCSqGSIb3\n"
+"DQEBAQUAA4IBDQAwggEIAoIBAQC3Msj+6XGmBIWtDBFk385N78gDGIc/oav7PKaf\n"
+"8MOh2tTYbitTkPskpD6E8J7oX+zlJ0T1KKY/e97gKvDIr1MvnsoFAZMej2YcOadN\n"
+"+lq2cwQlZut3f+dZxkqZJRRU6ybH838Z1TBwj6+wRir/resp7defqgSHo9T5iaU0\n"
+"X9tDkYI22WY8sbi5gv2cOj4QyDvvBmVmepsZGD3/cVE8MC5fvj13c7JdBmzDI1aa\n"
+"K4UmkhynArPkPw2vCHmCuDY96pzTNbO8acr1zJ3o/WSNF4Azbl5KXZnJHoe0nRrA\n"
+"1W4TNSNe35tfPe/W93bC6j67eA0cQmdrBNj41tpvi/JEoAGrAgEDo4HFMIHCMB0G\n"
+"A1UdDgQWBBS/X7fRzt0fhvRbVazc1xDCDqmI5zCBkgYDVR0jBIGKMIGHgBS/X7fR\n"
+"zt0fhvRbVazc1xDCDqmI56FspGowaDELMAkGA1UEBhMCVVMxJTAjBgNVBAoTHFN0\n"
+"YXJmaWVsZCBUZWNobm9sb2dpZXMsIEluYy4xMjAwBgNVBAsTKVN0YXJmaWVsZCBD\n"
+"bGFzcyAyIENlcnRpZmljYXRpb24gQXV0aG9yaXR5ggEAMAwGA1UdEwQFMAMBAf8w\n"
+"DQYJKoZIhvcNAQEFBQADggEBAAWdP4id0ckaVaGsafPzWdqbAYcaT1epoXkJKtv3\n"
+"L7IezMdeatiDh6GX70k1PncGQVhiv45YuApnP+yz3SFmH8lU+nLMPUxA2IGvd56D\n"
+"eruix/U0F47ZEUD0/CwqTRV/p2JdLiXTAAsgGh1o+Re49L2L7ShZ3U0WixeDyLJl\n"
+"xy16paq8U4Zt3VekyvggQQto8PT7dL5WXXp59fkdheMtlb71cZBDzI0fmgAKhynp\n"
+"VSJYACPq4xJDKVtHCN2MQWplBqjlIapBtJUhlbl90TSrE9atvNziPTnNvT51cKEY\n"
+"WQPJIrSPnNVeKtelttQKbfi3QBFGmh95DmK/D5fs4C8fF5Q=\n"
+"-----END CERTIFICATE-----\n"
+"\n"
+"# https://www.amazontrust.com/repository/\n"
+"Subject: C = US, O = Amazon, CN = Amazon Root CA 1\n"
+"Not Before: May 26 00:00:00 2015 GMT\n"
+"Not After : Jan 17 00:00:00 2038 GMT\n"
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDQTCCAimgAwIBAgITBmyfz5m/jAo54vB4ikPmljZbyjANBgkqhkiG9w0BAQsF\n"
+"ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6\n"
+"b24gUm9vdCBDQSAxMB4XDTE1MDUyNjAwMDAwMFoXDTM4MDExNzAwMDAwMFowOTEL\n"
+"MAkGA1UEBhMCVVMxDzANBgNVBAoTBkFtYXpvbjEZMBcGA1UEAxMQQW1hem9uIFJv\n"
+"b3QgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALJ4gHHKeNXj\n"
+"ca9HgFB0fW7Y14h29Jlo91ghYPl0hAEvrAIthtOgQ3pOsqTQNroBvo3bSMgHFzZM\n"
+"9O6II8c+6zf1tRn4SWiw3te5djgdYZ6k/oI2peVKVuRF4fn9tBb6dNqcmzU5L/qw\n"
+"IFAGbHrQgLKm+a/sRxmPUDgH3KKHOVj4utWp+UhnMJbulHheb4mjUcAwhmahRWa6\n"
+"VOujw5H5SNz/0egwLX0tdHA114gk957EWW67c4cX8jJGKLhD+rcdqsq08p8kDi1L\n"
+"93FcXmn/6pUCyziKrlA4b9v7LWIbxcceVOF34GfID5yHI9Y/QCB/IIDEgEw+OyQm\n"
+"jgSubJrIqg0CAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8EBAMC\n"
+"AYYwHQYDVR0OBBYEFIQYzIU07LwMlJQuCFmcx7IQTgoIMA0GCSqGSIb3DQEBCwUA\n"
+"A4IBAQCY8jdaQZChGsV2USggNiMOruYou6r4lK5IpDB/G/wkjUu0yKGX9rbxenDI\n"
+"U5PMCCjjmCXPI6T53iHTfIUJrU6adTrCC2qJeHZERxhlbI1Bjjt/msv0tadQ1wUs\n"
+"N+gDS63pYaACbvXy8MWy7Vu33PqUXHeeE6V/Uq2V8viTO96LXFvKWlJbYK8U90vv\n"
+"o/ufQJVtMVT8QtPHRh8jrdkPSHCa2XV4cdFyQzR1bldZwgJcJmApzyMZFo6IQ6XU\n"
+"5MsI+yMRQ+hDKXJioaldXgjUkK642M4UwtBV8ob2xJNDd2ZhwLnoQdeXeGADbkpy\n"
+"rqXRfboQnoZsG4q5WTP468SQvvG5\n"
+"-----END CERTIFICATE-----\n"
+"\n"
+"";
+
+static const char *s_cert =
+"-----BEGIN CERTIFICATE-----\n"
+"MIIDWjCCAkKgAwIBAgIVAPoY7Fz1DxA+/VgB/GdsOXwg45cRMA0GCSqGSIb3DQEB\n"
+"CwUAME0xSzBJBgNVBAsMQkFtYXpvbiBXZWIgU2VydmljZXMgTz1BbWF6b24uY29t\n"
+"IEluYy4gTD1TZWF0dGxlIFNUPVdhc2hpbmd0b24gQz1VUzAeFw0yMjA0MTExMjQw\n"
+"MTRaFw00OTEyMzEyMzU5NTlaMB4xHDAaBgNVBAMME0FXUyBJb1QgQ2VydGlmaWNh\n"
+"dGUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCvwVAUCWq4PCS0bsU5\n"
+"b4meX8klfoyp7yuSkHcPVhBv846TSIh5VeRSR68LOYAYRHaN6C2ybqhb5E42QKRX\n"
+"SOA37OFXR3HvcbLF7c7BPkT13kFpymZJA+KUIPZ2Ki2zwWDKi6uP2lZfNxMv9xLo\n"
+"8PGuWBCphzadbf4Hi4tGEs2BeXSXRCb4ZaI7gv3DdZHLHJuyrkF040E6flZrXmPv\n"
+"dumvmszNZxWl8iIA68Pk7M1npXCr/za9CkIdoeSslKVBY4S0FNSISOxMCMqpV8fS\n"
+"w4c8xQ0G4Whxgt1a6sGtm6TBGB1CjbAvQNyLWFeL2U8RRbG82xo5GYuemkaodCvH\n"
+"/sBRAgMBAAGjYDBeMB8GA1UdIwQYMBaAFMdnILw/0ZLaKJ2dH2GZTXKu0ciZMB0G\n"
+"A1UdDgQWBBQahyFNkNwZFKmVi+c6uWW9Iif95TAMBgNVHRMBAf8EAjAAMA4GA1Ud\n"
+"DwEB/wQEAwIHgDANBgkqhkiG9w0BAQsFAAOCAQEAb4Tlb2kvWcv5Dz4kCc43AFbA\n"
+"Jv1MHwltznedpiyAyqXGU8s6UJCrhHKpjABHHcigkCD3iUlxLMTNhzEuTNBR1zfS\n"
+"PMVP5EVmzOSRGvQNvhURRGkGVlNytv4VHTzaZUcuqhqNvw/Slvo0i2vlAPK0VIKQ\n"
+"EPNle86zpUypAf2UlyrOT5vD1s7x5HmoHiKdUMqEiB6G/rack4vtUpA2V8fugKrH\n"
+"QmBVXWHqTbpTUbqPk3PxmV1zqt5C9ZRVjjIDvW+Hl2zfVEoVq8l6BcLZmxFUnvA/\n"
+"/aBWQ3k+V1fg3dUck3OCRGMsYYgBsvey6X+9oa+JFZh5mFtjA45C2SRtYtLesQ==\n"
+"-----END CERTIFICATE-----\n"
+"";
+
+static const char *s_key =
+"-----BEGIN RSA PRIVATE KEY-----\n"
+"MIIEowIBAAKCAQEAr8FQFAlquDwktG7FOW+Jnl/JJX6Mqe8rkpB3D1YQb/OOk0iI\n"
+"eVXkUkevCzmAGER2jegtsm6oW+RONkCkV0jgN+zhV0dx73Gyxe3OwT5E9d5Bacpm\n"
+"SQPilCD2diots8Fgyourj9pWXzcTL/cS6PDxrlgQqYc2nW3+B4uLRhLNgXl0l0Qm\n"
+"+GWiO4L9w3WRyxybsq5BdONBOn5Wa15j73bpr5rMzWcVpfIiAOvD5OzNZ6Vwq/82\n"
+"vQpCHaHkrJSlQWOEtBTUiEjsTAjKqVfH0sOHPMUNBuFocYLdWurBrZukwRgdQo2w\n"
+"L0Dci1hXi9lPEUWxvNsaORmLnppGqHQrx/7AUQIDAQABAoIBAHX/c6QALoZC2uHI\n"
+"/ODy4ZJS/NkPfaEZ0kc0drr1LVP8UVzQ9c+AuyoCtqLyl+2zCWV83DFP2fjX7yq9\n"
+"e5iedOsXPrM6ZGQ+EaiRYJ6dD++CqKg+Gy4qTZTmDJKI/uYQjsttumF6VULX1yn8\n"
+"19VM7vX+ajFndmN71XF7XqZNOWwS4kEk5znQ7oesMOzPazRDsdJmCCnvVc4h99jJ\n"
+"IYOtCs9s2aLoSD/7lATKaVquuRNBdkcWmKqc3vYMUQwjk14ID7t31TBZtlLJC+Df\n"
+"tn+LCH1C0cuTq86VV17lc9ObTj/xkc8tb3OEYAv8E7rOioJVKU6EMViGa0oJk1+f\n"
+"tW6hqYECgYEA1GR0z69HzeGZun2ZbjX7DC8EPAI4PZY5EZ1O7RZQorLLKP7R+9sg\n"
+"KtgSJwtKAgpi84I0iuMbE2VciCYfXao+UpWLxkAPZkAt6qcMGJ0kYVd42n0Rwesh\n"
+"8bd/r6ojSnj0DY7zAsoXctdQiNDiGmCyrDvWqmGuM6XCDcuzlG4LbkMCgYEA09cq\n"
+"tSDyZowGWafKIDW4JXLE3PQdJStM3hAmNisrx0mRB7HmNgs3gR4/L4giZnE2hI+O\n"
+"6IofiLjDjSmenWkvWw8Jy/QrhWpAuWlfeEpHaN910IXemFyqzMz0jL9s/Bn4BOYQ\n"
+"WiqV19Pj4EjSrum76e17mBNq8vc72C4wXS3gj9sCgYB2q/KAoIVUSbtlcgwqgkrV\n"
+"Uefhx7O45ZjZeLXCzvcbER9mtoqJWLQufDAYVLxzS25idNv6xk44ligPgo1//kF4\n"
+"T0qb6OsxzKZbOB8QGa1cHk3OdpdXbJO4xTi45C13zQFAGiE568USS7AZ4eyTpHfw\n"
+"uDaHWLDG9tTodGrQgnQslQKBgFvdPwP1Gakmp8pRXPHC2exDbON0aP8pW9ggoLF0\n"
+"3zM4z8/Kcc6V5qfzeese2ewaxE2QA6UL4MjldsfMeKBCcOrIBrOPWyAsB41gCKqd\n"
+"a4IrBWg75V+lL9xINPSkPprEmC1np0eyl/BUTsmASvzXF0pGVgaIxSQ/2o/Q1+BQ\n"
+"eMVpAoGBALiFGVLxSow60Cve7BRaUuKa+pfqPeuCW+bSLD5hy6hQeHInUtRJT7tW\n"
+"NFC8y7zUpKRCENCqXbBsYe1x2HEdGtDv9NV4vjcvF63Dj90ZZVXQkSiLXkWvJu76\n"
+"7sRX7dX2coR6LlQ+zwwkyDIh2wP2MAWXbYLeG8xbLp8a2ybueSZl\n"
+"-----END RSA PRIVATE KEY-----\n"
+"";
+
+#endif
--- a/examples/zephyr/mqtt-client-aws-client/src/main.c
+++ b/examples/zephyr/mqtt-client-aws-client/src/main.c
@ -0,0 +1,109 @@
+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+#include "certs.h"
+
+struct mg_mgr mgr;
+
+static const char *s_debug_level = "3";
+static time_t s_boot_timestamp = 0;
+static struct mg_connection *s_sntp_conn = NULL;
+static const char *s_url = "mqtts://a3nkain3cvvy7l-ats.iot.us-east-1.amazonaws.com";
+
+static const char *s_rx_topic = "d/rx";
+static const char *s_tx_topic = "d/tx";
+static int s_qos = 1;
+static int s_connected = 0;
+
+static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_OPEN) {
+    // c->is_hexdumping = 1;
+  } else if (ev == MG_EV_ERROR) {
+    // On error, log error message
+    MG_ERROR(("%p %s", c->fd, (char *) ev_data));
+  } else if (ev == MG_EV_CONNECT) {
+    // Set up 2-way TLS that is required by AWS IoT
+    struct mg_tls_opts opts = {
+        .ca = s_ca, .cert = s_cert, .certkey = s_key};
+    mg_tls_init(c, &opts);
+  } else if (ev == MG_EV_MQTT_OPEN) {
+    // MQTT connect is successful
+    struct mg_str topic = mg_str(s_rx_topic);
+    MG_INFO(("Connected to %s", s_url));
+    MG_INFO(("Subscribing to %s", s_rx_topic));
+    mg_mqtt_sub(c, topic, s_qos);
+    c->label[0] = 'X';  // Set a label that we're logged in
+  } else if (ev == MG_EV_MQTT_MSG) {
+    // When we receive MQTT message, print it
+    struct mg_mqtt_message *mm = (struct mg_mqtt_message *) ev_data;
+    MG_INFO(("Received on %.*s : %.*s", (int) mm->topic.len, mm->topic.ptr,
+             (int) mm->data.len, mm->data.ptr));
+  } else if (ev == MG_EV_POLL && c->label[0] == 'X') {
+    static unsigned long prev_second;
+    unsigned long now_second = (*(unsigned long *) ev_data) / 1000;
+    if (now_second != prev_second) {
+      struct mg_str topic = mg_str(s_tx_topic), data = mg_str("{\"a\":123}");
+      MG_INFO(("Publishing to %s", s_tx_topic));
+      mg_mqtt_pub(c, topic, data, s_qos, false);
+      prev_second = now_second;
+    }
+  }
+}
+
+// We have no valid system time(), and we need it for TLS. Implement it
+time_t time(time_t *tp) {
+  time_t t = s_boot_timestamp + k_uptime_get() / 1000;
+  if (tp != NULL) *tp = t;
+  return t;
+}
+
+// SNTP callback. Modifies s_boot_timestamp, to make time() correct
+static void sfn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_SNTP_TIME) {
+    int64_t t = *(int64_t *) ev_data;
+    MG_INFO(("Got SNTP time: %lld ms from epoch", t));
+    s_boot_timestamp = (time_t) ((t - mg_millis()) / 1000);
+
+    // We need correct time in order to get HTTPs working, therefore,
+    // making https request from SMTP callback
+    if(!s_connected) {
+      MG_INFO(("Connecting to    : [%s]", s_url));
+      struct mg_mqtt_opts opts = {.clean = true};
+      mg_mqtt_connect(&mgr, s_url, &opts, fn, NULL);  // Create client connection
+      s_connected = 1;
+    }
+  } else if (ev == MG_EV_CLOSE) {
+    s_sntp_conn = NULL;
+  }
+}
+
+// Periodic timer syncs time via SNTP
+static void timer_fn(void *arg) {
+  struct mg_mgr *mgr = (struct mg_mgr *) arg;
+  if (s_sntp_conn == NULL) s_sntp_conn = mg_sntp_connect(mgr, NULL, sfn, NULL);
+  if (s_boot_timestamp < 9999) mg_sntp_send(s_sntp_conn, time(NULL));
+}
+
+// Use Zephyr's printk() for Mongooose MG_* logging
+static void logfn(const void *ptr, size_t len, void *userdata) {
+  printk("%.*s", (int) len, (char *) ptr);
+}
+
+int main(int argc, char *argv[]) {
+  mg_log_set(s_debug_level);
+  mg_log_set_callback(logfn, NULL);
+
+  mg_mgr_init(&mgr);
+
+  struct mg_timer t;
+  mg_timer_init(&t, 5000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, timer_fn, &mgr);
+
+  // Start infinite event loop
+  MG_INFO(("Mongoose version : v%s", MG_VERSION));
+  mg_http_connect(&mgr, s_url, fn, NULL);  // Create client connection
+
+  for (;;) mg_mgr_poll(&mgr, 1000);
+  mg_mgr_free(&mgr);
+  return 0;
+}
--- a/examples/zephyr/websocket-server/CMakeLists.txt
+++ b/examples/zephyr/websocket-server/CMakeLists.txt
@ -0,0 +1,11 @@
+# Copyright (c) 2022 Cesanta Software Limited
+# Mail: support@cesanta.com
+#
+# SPDX-License-Identifier: GPL2.0 or commercial
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(http_server)
+#add_definitions(-DMG_ENABLE_LINES=1)
+add_definitions(-DMG_ENABLE_MBEDTLS=1)
+target_sources(app PRIVATE src/main.c src/mongoose.c)
--- a/examples/zephyr/websocket-server/Makefile
+++ b/examples/zephyr/websocket-server/Makefile
@ -0,0 +1,16 @@
+CWD = $(realpath $(CURDIR))
+ZEPHYR_DIR ?= $(realpath ../../../../zephyrproject)
+BOARD ?= nucleo_h743zi
+
+example:
+	true
+
+build:
+	cp ../../../mongoose.c ../../../mongoose.h src/
+	cd $(ZEPHYR_DIR) && west build -b $(BOARD) -p auto $(CWD)
+
+flash:
+	cd $(ZEPHYR_DIR) && west flash
+
+clean:
+	rm -rf */*/mongoose.*
--- a/examples/zephyr/websocket-server/prj.conf
+++ b/examples/zephyr/websocket-server/prj.conf
@ -0,0 +1,27 @@
+CONFIG_NETWORKING=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_TCP=y
+CONFIG_NET_UDP=y
+CONFIG_NET_DHCPV4=y
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_SOCKETS_POLL_MAX=32
+CONFIG_POSIX_MAX_FDS=32
+CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_NET_LOG=y
+
+CONFIG_LOG=y
+CONFIG_ISR_STACK_SIZE=2048
+CONFIG_MAIN_STACK_SIZE=8192
+CONFIG_IDLE_STACK_SIZE=1024
+
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=2048
+CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
+CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED=y
+CONFIG_MBEDTLS_ECP_ALL_ENABLED=y
+
+CONFIG_MINIMAL_LIBC_RAND=y
+CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE=32756
+
+CONFIG_FILE_SYSTEM_LITTLEFS=y
--- a/examples/zephyr/websocket-server/src/certs.h
+++ b/examples/zephyr/websocket-server/src/certs.h
@ -0,0 +1,24 @@
+#ifndef CERTS_H_
+#define CERTS_H_
+
+static const char *s_ssl_cert =
+"-----BEGIN CERTIFICATE-----\r\n"                                       \
+"MIIBhzCCASygAwIBAgIUbnMoVd8TtWH1T09dANkK2LU6IUswCgYIKoZIzj0EAwIw\r\n"  \
+"RDELMAkGA1UEBhMCSUUxDzANBgNVBAcMBkR1YmxpbjEQMA4GA1UECgwHQ2VzYW50\r\n"  \
+"YTESMBAGA1UEAwwJVGVzdCBSb290MB4XDTIwMDUwOTIxNTE0OVoXDTMwMDUwOTIx\r\n"  \
+"NTE0OVowETEPMA0GA1UEAwwGc2VydmVyMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcD\r\n"  \
+"QgAEkuBGnInDN6l06zVVQ1VcrOvH5FDu9MC6FwJc2e201P8hEpq0Q/SJS2nkbSuW\r\n"  \
+"H/wBTTBaeXN2uhlBzMUWK790KKMvMC0wCQYDVR0TBAIwADALBgNVHQ8EBAMCA6gw\r\n"  \
+"EwYDVR0lBAwwCgYIKwYBBQUHAwEwCgYIKoZIzj0EAwIDSQAwRgIhAPo6xx7LjCdZ\r\n"  \
+"QY133XvLjAgVFrlucOZHONFVQuDXZsjwAiEAzHBNligA08c5U3SySYcnkhurGg50\r\n"  \
+"BllCI0eYQ9ggp/o=\r\n"                                                  \
+"-----END CERTIFICATE-----\r\n";
+
+static const char *s_ssl_key =
+"-----BEGIN PRIVATE KEY-----\r\n"                                       \
+"MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQglNni0t9Dg9icgG8w\r\n"  \
+"kbfxWSS+TuNgbtNybIQXcm3NHpmhRANCAASS4EacicM3qXTrNVVDVVys68fkUO70\r\n"  \
+"wLoXAlzZ7bTU/yESmrRD9IlLaeRtK5Yf/AFNMFp5c3a6GUHMxRYrv3Qo\r\n"          \
+"-----END PRIVATE KEY-----\r\n";
+
+#endif
--- a/examples/zephyr/websocket-server/src/main.c
+++ b/examples/zephyr/websocket-server/src/main.c
@ -0,0 +1,92 @@
+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+#include "certs.h"
+
+static const char *s_debug_level = "3";
+static const char *s_web_dir = "/";
+static const char *s_ws_addr = "ws://0.0.0.0:8000";
+static const char *s_wss_addr = "wss://0.0.0.0:8443";
+static time_t s_boot_timestamp = 0;
+static struct mg_connection *s_sntp_conn = NULL;
+
+// This RESTful server implements the following endpoints:
+//   /websocket - upgrade to Websocket, and implement websocket echo server
+//   /api/rest - respond with JSON string {"result": 123}
+static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_OPEN) {
+    c->is_hexdumping = 1;
+  } else if (ev == MG_EV_ACCEPT && fn_data != NULL) {
+    struct mg_tls_opts opts = {.cert = s_ssl_cert, .certkey = s_ssl_key};
+    mg_tls_init(c, &opts);
+  } else if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    if (mg_http_match_uri(hm, "/websocket")) {
+      // Upgrade to websocket. From now on, a connection is a full-duplex
+      // Websocket connection, which will receive MG_EV_WS_MSG events.
+      mg_ws_upgrade(c, hm, NULL);
+    } else if (mg_http_match_uri(hm, "/rest")) {
+      // Serve REST response
+      mg_http_reply(c, 200, "", "{\"result\": %d}\n", 123);
+    } 
+  } else if (ev == MG_EV_WS_MSG) {
+    // Got websocket frame. Received data is wm->data. Echo it back!
+    struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
+    mg_ws_send(c, wm->data.ptr, wm->data.len, WEBSOCKET_OP_TEXT);
+  }
+  (void) fn_data;
+}
+
+// We have no valid system time(), and we need it for TLS. Implement it
+time_t time(time_t *tp) {
+  time_t t = s_boot_timestamp + k_uptime_get() / 1000;
+  if (tp != NULL) *tp = t;
+  return t;
+}
+
+// SNTP callback. Modifies s_boot_timestamp, to make time() correct
+static void sfn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_SNTP_TIME) {
+    int64_t t = *(int64_t *) ev_data;
+    MG_INFO(("Got SNTP time: %lld ms from epoch", t));
+    s_boot_timestamp = (time_t) ((t - mg_millis()) / 1000);
+  } else if (ev == MG_EV_CLOSE) {
+    s_sntp_conn = NULL;
+  }
+}
+
+// Periodic timer syncs time via SNTP
+static void timer_fn(void *arg) {
+  struct mg_mgr *mgr = (struct mg_mgr *) arg;
+  if (s_sntp_conn == NULL) s_sntp_conn = mg_sntp_connect(mgr, NULL, sfn, NULL);
+  if (s_boot_timestamp < 9999) mg_sntp_send(s_sntp_conn, time(NULL));
+}
+
+// Use Zephyr's printk() for Mongooose MG_* logging
+static void logfn(const void *ptr, size_t len, void *userdata) {
+  printk("%.*s", (int) len, (char *) ptr);
+}
+
+int main(int argc, char *argv[]) {
+  struct mg_mgr mgr;
+
+  mg_log_set(s_debug_level);
+  mg_log_set_callback(logfn, NULL);
+
+  mg_mgr_init(&mgr);
+  mg_http_listen(&mgr, s_ws_addr, fn, NULL);
+  mg_http_listen(&mgr, s_wss_addr, fn, &mgr);
+
+  struct mg_timer t;
+  mg_timer_init(&t, 5000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, timer_fn, &mgr);
+
+  // Start infinite event loop
+  MG_INFO(("Mongoose version : v%s", MG_VERSION));
+  MG_INFO(("Listening on     : %s", s_ws_addr));
+  MG_INFO(("Listening on     : %s", s_wss_addr));
+  MG_INFO(("Web root         : [%s]", s_web_dir));
+  for (;;) mg_mgr_poll(&mgr, 1000);
+  mg_mgr_free(&mgr);
+  return 0;
+}