esp8266/help: Add cheatsheet for basic WiFi configuration.

esp8266/help.c

@@ -34,6 +34,20 @@ STATIC const char *help_text =
 "For online docs please visit http://docs.micropython.org/en/latest/esp8266/ .\n"
 "To get diagnostic information to include in bug reports, execute 'import port_diag'.\n"
 "\n"
+"Basic WiFi configuration:\n"
+"\n"
+"import network\n"
+"sta_if = network.WLAN(network.STA_IF)\n"
+"# Scan for available access points:\n"
+"sta_if.scan()\n"
+"# Connect to an AP\n"
+"sta_if.connect(\"<AP_name>\", \"<password>\")\n"
+"# Check for successful connection:\n"
+"sta_if.isconnected()\n"
+"# Change name/password of ESP8266's AP:\n"
+"ap_if = network.WLAN(network.AP_IF)\n"
+"ap_if.config(essid=\"<AP_NAME>\", authmode=network.AUTH_WPA_WPA2_PSK, password=\"<password>\")\n"
+"\n"
 "Control commands:\n"
 "  CTRL-A        -- on a blank line, enter raw REPL mode\n"
 "  CTRL-B        -- on a blank line, enter normal REPL mode\n"