Enable wifi auto-connect

Settings for saving wifi creds, enable auto-connect.

Also fix TLS on Zephyr v4.3.0 at least (PSA might work better on v4.4
dev?), by disabling PSA.

Author: noahp

prj.conf

@@ -40,6 +40,14 @@ CONFIG_NET_L2_WIFI_SHELL=y
 CONFIG_NET_L2_ETHERNET=y
 CONFIG_ESP32_WIFI_STA_AUTO_DHCPV4=y
 
+CONFIG_SETTINGS=y
+CONFIG_SETTINGS_NVS=y
+CONFIG_NVS=y
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
+CONFIG_WIFI_CREDENTIALS=y
+CONFIG_WIFI_CREDENTIALS_CONNECT_STORED=y
+
 # Memfault configuration
 CONFIG_MEMFAULT=y
 CONFIG_MEMFAULT_LOGGING_ENABLE=y
@@ -64,7 +72,12 @@ CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=4096
 CONFIG_MBEDTLS_MEMORY_DEBUG=y
 CONFIG_MBEDTLS_SHELL=y
 CONFIG_MBEDTLS_AES_ROM_TABLES=y
-CONFIG_MBEDTLS_PSA_CRYPTO_C=y
+
+# Disable PSA Crypto. We are missing some key flag or feature in PSA Crypto that
+# prevents establishing a TLS connection with Memfault. Using MbedTLS built in
+# ("legacy") crypto instead, which works fine.
+# CONFIG_MBEDTLS_PSA_CRYPTO_C=y
+CONFIG_MBEDTLS_USE_PSA_CRYPTO=n
 
 # Credential shell, useful for debug
 CONFIG_TLS_CREDENTIALS_SHELL=y
@@ -86,8 +99,8 @@ CONFIG_MEMFAULT_COREDUMP_COLLECT_TASKS_REGIONS=n
 
 # Memfault's http client needs a small amount of heap. Zephyr requires a minimum
 # heap size for the applied configuration, so select that here to prevent a
-# build time message
-CONFIG_HEAP_MEM_POOL_SIZE=52224
+# build time message. ESP32 WiFi adapter requires additional heap for buffers.
+CONFIG_HEAP_MEM_POOL_SIZE=98304
 CONFIG_SYS_HEAP_RUNTIME_STATS=y
 CONFIG_SHELL_STACK_SIZE=4096
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

src/main.c

@@ -1,8 +1,12 @@
 //! @file
 
+#include <stdio.h>
 #include <string.h>
 #include <zephyr/kernel.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/net/net_if.h>
+#include <zephyr/net/net_mgmt.h>
+#include <zephyr/net/wifi_mgmt.h>
 
 #include "app_version.h"
 #include "memfault/components.h"
@@ -15,14 +19,30 @@ LOG_MODULE_REGISTER(mflt_app, LOG_LEVEL_DBG);
 // Memfault SDK release
 extern const char* memfault_zephyr_get_device_id(void);
 
+static const char* prv_get_software_version(void) {
+  static char s_software_version[64];
+
+  // CI builds will often set git sha = "". in that case, omit that portion of
+  // the software version string
+  if (ZEPHYR_MEMFAULT_EXAMPLE_GIT_SHA1[0] == '\0') {
+    return CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_SOFTWARE_VERSION;
+  }
+
+  // Otherwise, append it to demonstrate how to include git sha in the software
+  // version string
+  snprintf(s_software_version, sizeof(s_software_version), "%s+%s",
+           CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_SOFTWARE_VERSION,
+           ZEPHYR_MEMFAULT_EXAMPLE_GIT_SHA1);
+  return s_software_version;
+}
+
 void memfault_platform_get_device_info(sMemfaultDeviceInfo* info) {
   // override the software version only to demonstrate inserting the GIT SHA
   *info = (sMemfaultDeviceInfo){
-    .device_serial = memfault_zephyr_get_device_id(),
-    .software_type = CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_SOFTWARE_TYPE,
-    .software_version =
-      CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_SOFTWARE_VERSION "+" ZEPHYR_MEMFAULT_EXAMPLE_GIT_SHA1,
-    .hardware_version = CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_HARDWARE_VERSION,
+      .device_serial = memfault_zephyr_get_device_id(),
+      .software_type = CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_SOFTWARE_TYPE,
+      .software_version = prv_get_software_version(),
+      .hardware_version = CONFIG_MEMFAULT_BUILTIN_DEVICE_INFO_HARDWARE_VERSION,
   };
 }
 
@@ -33,6 +53,15 @@ int main(void) {
 
   memfault_device_info_dump();
   memfault_zephyr_port_install_root_certs();
+  // Initiate auto connection on the wifi interface
+  struct net_if* iface = net_if_get_default();
+  int rc = net_mgmt(NET_REQUEST_WIFI_CONNECT_STORED, iface, NULL, 0);
+
+  if (rc) {
+    printk(
+        "an error occurred when trying to auto-connect to a network. err: %d",
+        rc);
+  }
 
   return 0;
 }