Store ESP32 settings in the nvs

.gitignore

@@ -132,3 +132,4 @@ dmypy.json
 
 ##
 production.py
+settings.h

arduino/eeprom_prog/eeprom_prog.ino

@@ -20,23 +20,19 @@
 
 #include <EEPROM.h>
 #include <Ethernet.h>
+#include "settings.h"
 
 #define ERASE_FIRST 0
 
 const byte mac[] = {
   0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
 };
-const char serial[] = "abcd1234";
+const char serial[] = SERIAL;
 
 struct netConfig {
-  IPAddress address;
-  unsigned int port;
-};
-
-netConfig config = {
-  {192, 168, 10, 123},
-  80
-};
+  IPAddress address = REMOTE_IP;
+  unsigned int port = REMOTE_PORT;
+} config;
 
 void setup() {
 

arduino/eeprom_prog/settings.h.tmpl

@@ -0,0 +1,23 @@
+/* -*- coding: utf-8 -*-
+* vim: tabstop=2 shiftwidth=2 softtabstop=2 syntax=c
+*
+* BITE - A Basic/IoT/Example
+* Copyright (C) 2020-2021 Daniele Viganò <daniele@vigano.me>
+*
+* BITE is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* BITE is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define SERIAL "uno_1"
+#define REMOTE_IP {192, 168, 0, 1}
+#define REMOTE_PORT 80

esp32/nvs_prog/nvs_prog.ino

@@ -0,0 +1,75 @@
+/* -*- coding: utf-8 -*-
+* vim: tabstop=2 shiftwidth=2 softtabstop=2
+*
+* BITE - A Basic/IoT/Example
+* Copyright (C) 2020-2021 Daniele Viganò <daniele@vigano.me>
+*
+* BITE is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* BITE is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <Preferences.h>
+#include <Ethernet.h>
+#include "settings.h"
+
+#define ERASE_FIRST 1
+
+Preferences preferences;
+const char* serial = SERIAL;
+
+const char* ssid = SECRET_SSID;
+const char* password = SECRET_PASSWORD;
+
+struct netConfig {
+  IPAddress address = REMOTE_IP;
+  unsigned int port = REMOTE_PORT;
+} config;
+
+void setup() {
+
+  Serial.begin(115200);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  preferences.begin("iot", false);
+#if ERASE_FIRST
+  Serial.println("Erasing IoT data");
+  preferences.clear();
+#endif
+  Serial.print("Writing IoT data");
+  preferences.putString("serial", serial);
+  Serial.print(".");
+  Serial.println(".");
+
+  preferences.putBytes("config", &config, sizeof(config));
+  Serial.println("Committing...");
+  preferences.end();
+  Serial.println("IoT data written!");
+
+  preferences.begin("wifi", false);
+#if ERASE_FIRST
+  Serial.println("Erasing WiFI data");
+  preferences.clear();
+#endif
+  Serial.println("Writing WiFi data");
+  preferences.putString("ssid", ssid);
+  preferences.putString("password", password);
+  Serial.println("Committing...");
+  preferences.end();
+  Serial.println("WiFi data written!");
+}
+
+void loop() {
+  /* Empty loop */
+}

esp32/nvs_prog/settings.h.tmpl

@@ -0,0 +1,25 @@
+/* -*- coding: utf-8 -*-
+* vim: tabstop=2 shiftwidth=2 softtabstop=2 syntax=c
+*
+* BITE - A Basic/IoT/Example
+* Copyright (C) 2020-2021 Daniele Viganò <daniele@vigano.me>
+*
+* BITE is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* BITE is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define SERIAL "<fillme>"
+#define REMOTE_IP {192, 168, 0, 1}
+#define REMOTE_PORT 80
+#define SECRET_SSID "<fillme>"
+#define SECRET_PASSWORD "<fillme>"

esp32/rssiHall/rssiHall.ino

@@ -18,7 +18,7 @@
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <EEPROM.h>
+#include <Preferences.h>
 #include <WiFi.h>
 #include <WiFiUdp.h>
 #include <PubSubClient.h>
@@ -33,6 +33,8 @@
 // const String serverName = "sensor.server.domain";
 const size_t capacity = 2 * JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(2) + 20;
 
+Preferences preferences;
+
 DynamicJsonDocument telemetry(capacity);
 JsonObject payload = telemetry.createNestedObject("payload");
 
@@ -45,20 +47,12 @@ bool NTPValid = false;
 WiFiClient ethClient;
 PubSubClient clientMQTT(ethClient);
 
-const char* ssid = "";
-const char* password = "";
-const char* serial = "esp32_1";
-
 struct netConfig {
   IPAddress address;
   unsigned int port;
-};
-
-netConfig config = {
-  {192, 168, 10, 123},
-  80
-};
+} config;
 
+char* serial;
 const String apiURL = "/api/device/subscribe/";
 const String telemetryURL = "/telemetry/";
 
@@ -67,22 +61,32 @@ void setup(void) {
 
   StaticJsonDocument<64> api;
 
-  /*
-  int eeAddress = 0;
+  preferences.begin("iot");
+  // Get the serial number from flash
+  serial = strdup(preferences.getString("serial").c_str());
 
-  EEPROM.get(eeAddress, serial);
-  eeAddress += sizeof(serial);
-  EEPROM.get(eeAddress, config);
-  */
+  // Get network configuration
+  size_t _len = preferences.getBytesLength("config");
+  char _buffer[_len];
+  preferences.getBytes("config", &_buffer, _len);
+  memcpy(&config, _buffer, _len);
+  preferences.end();
 
-  Serial.println("Starting connecting WiFi.");
+  // Get WiFi parameters
+  preferences.begin("wifi");
+  const char* _ssid = strdup(preferences.getString("ssid").c_str());
+  const char* _password = strdup(preferences.getString("password").c_str());
+  preferences.end();
+
+  Serial.print("Starting connecting WiFi to ");
+  Serial.print(_ssid);
   delay(10);
-  WiFi.begin(ssid, password);
+  WiFi.begin(_ssid, _password);
   while (WiFi.status() != WL_CONNECTED) {
     delay(500);
     Serial.print(".");
   }
-  Serial.println("WiFi connected");
+  Serial.println("\nWiFi connected");
 
   Serial.print("IoT #");
   Serial.print(serial);
@@ -90,7 +94,7 @@ void setup(void) {
   Serial.println(WiFi.localIP());
   Serial.println();
   Serial.print("Connecting to: ");
-  Serial.print(config.address);
+  Serial.print(config.address.toString());
   Serial.print(":");
   Serial.print(config.port);
   Serial.print(" every ");
@@ -173,7 +177,7 @@ void postData(const netConfig &postAPI, const String &URL, const DynamicJsonDocu
     ethClient.print(URL);
     ethClient.println(" HTTP/1.1");
     ethClient.print("Host: ");
-    ethClient.print(postAPI.address);
+    ethClient.print(postAPI.address.toString());
     ethClient.print(":");
     ethClient.println(postAPI.port);
     ethClient.println("Content-Type: application/json");