In my other post I wrote about setting up the ESP32 WiFi credentials over BLE. While testing and playing around with different phones, I found that even a quite new (but as well very cheap phone) I have does not support BLE. So I sat back in front of my development IDE and wrote something similar, but this time using Bluetooth Serial as communication. Most of the code is the same as in ESP32 WiFi setup over BLE so I
Read more
Most small applications that we write have the WiFi credentials integrated in the code. But sometimes you do not want to have your WiFi credentials in the source code, specially if it is open source and maybe accessible as a repository on Github or Bitbucket. Having the WiFi credentials in the code is as well not practical if you sell your devices to others that need to setup the WiFi credentials according to their local network. There are several solutions
Read more
Overview Sometimes it is necessary to switch the ESP8266’s connection between two WiFi access points. For example if you have a second AP in your house as a backup if your main AP fails. In my case I stumbled over a connectivity problem with my ESP8266 devices. On my lot I needed to have 2 WiFi access points, because the WiFi modem/router I got from my ISP has a really lousy WiFi range (internal antenna). So I added a second
Read moreWhen the ESP32 is activating it’s accesspoint and then tries to connect as a client to another WiFi AP, the connection can fail. Reported by user josmunpav in issue 653. Possible solution is to set WiFi first into WIFI_MODE_APSTA mode first. Example initialization sequence:
|
1 2 3 |
WiFi.mode( WIFI_MODE_APSTA ); WiFi.softAP(wifiName, wifiPassword); WiFi.begin(connectoToWifiSSID, connectToWifiPassword); |
User mickeypop investigated and found some solutions:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 |
setup() { WiFi.begin( rssiSSID , password ); int WLcount = 0; while (WiFi.status() != WL_CONNECTED && WLcount < 250 ) { delay( 100 ); #ifdef DEBUG Serial.print("."); #endif ++WLcount; } } void loop() { if (WiFi.status() == WL_CONNECTED) { // PUT_YOUR_UP_TIME_CODE_HERE #ifdef DEBUG Serial.print("C"); if (UpCount >= 20) // just keep terminal from scrolling sideways { UpCount = 0; Serial.println(); } ++UpCount; #endif // END WiFi connected loop() } else { // PUT_YOUR_DOWN_TIME_CODE_HERE // WiFi DOWN loop #ifdef DEBUG WFstatus = getWifiStatus( WFstatus ); #endif WiFi.begin( rssiSSID , password ); int WLcount = 0; // loop - depending on router, connect can be from 4 - 20 seconds // usually longer to reconnect than the connect at boot // lopping till reconnect seems to let it settle // usually around 80 count to breakout while (WiFi.status() != WL_CONNECTED && WLcount < 250 ) { delay( 100 ); #ifdef DEBUG Serial.print("."); // just keep terminal from scrolling sideways in test if (UpCount >= 20) { UpCount = 0; Serial.println(); } ++UpCount; #endif ++WLcount; } delay( 1000 ); } // END WiFi DOWN } // END loop() int getWifiStatus( int WiFiStatus ) { WiFiStatus = WiFi.status(); Serial.print("\tStatus "); Serial.print( WiFiStatus ); switch( WiFiStatus ) { case WL_IDLE_STATUS : // WL_IDLE_STATUS = 0, Serial.println(", WiFi IDLE "); break; case WL_NO_SSID_AVAIL: // WL_NO_SSID_AVAIL = 1, Serial.println(", NO SSID AVAIL "); break; case WL_SCAN_COMPLETED: // WL_SCAN_COMPLETED = 2, Serial.println(", WiFi SCAN_COMPLETED "); break; case WL_CONNECTED: // WL_CONNECTED = 3, Serial.println(", WiFi CONNECTED "); WiFi.persistent(true); break; case WL_CONNECT_FAILED: // WL_CONNECT_FAILED = 4, Serial.println(", WiFi WL_CONNECT FAILED"); break; case WL_CONNECTION_LOST: // WL_CONNECTION_LOST = 5, Serial.println(", WiFi CONNECTION LOST"); WiFi.persistent(false); // don't keep writing FLASH break; case WL_DISCONNECTED: // WL_DISCONNECTED = 6 Serial.println(", WiFi DISCONNECTED =="); break; } return WiFiStatus; } // END getWifiStatus() |
Additional explanations: While one bypasses some library issues the other uses the WiFi.onEvent() service, both simply detect when a connection is broken and re-initiate a new connection. While some have noted after several hours they keep getting bumped, this is almost certainly a function of the lease time of DHCP server in the router. If the lease time of the router is not the same sometimes devices “forget” to update causing a no IP
Read moreIf you have WiFi connection problems where WiFi.status() always returns WL_NO_SSID_AVAIL even you are sure that the AP is available and working, it might be that the NVS storage has been corrupted. The NVS storage is the place where esp-idf stores the WiFi credentials. See issue wifi connection problem on Arduino-esp32. To check if your NVS storage is corrupted you can use ESP32-Show_nvs_keys provided by stickbreaker. If your NVS storage is corrupted you can use the following code snippet to
Read moreSSDP or Simple Service Discovery Protocol is useful to find other devices and services in the local network. marian-craciunescu ported the ESP8266 version of the uSSDP library to work on the ESP32. Code and examples are on the Github repo.
Read moreAt the moment there is no ping library in the Arduino framework for ESP32. pbecchi ported one from ESP8266 that can be used on the ESP32. Code and example can be found on his Github repo. Another code example from bill-orange is inside the issue comments.
Read morerudi48 made some investigations regarding power saving during deep sleep here. Summary: To achieve maximum power saving during deep sleep it is necessary to switch off Bluetooth and WiFi before calling esp_deep_sleep_start(); Example:
|
1 2 3 4 5 6 |
#include <esp_wifi.h> #include <esp_bt.h> ... esp_wifi_stop(); esp_bt_controller_disable(); esp_deep_sleep_start(); |
Read more
If information about stored WiFi AP or WiFi STA configuration is needed before the WiFi AP is connected or the WiFi STA is activated, ESP-IDF provides the function esp_wifi_get_config() which fills the structure of the type wifi_config_t
Read more