PPPoS example: Move pin configuration to menuconfig, add log statement

Also remove spurious infinite loop in app_main()

examples/protocols/pppos_client/main/Kconfig.projbuild

@@ -1,21 +1,49 @@
-menu "GSM configuration"
+menu "Example Configuration"
 
 config GSM_INTERNET_USER
-    string "Internet User"
+    string "GSM Internet User"
 	default ""
 	help
 		Network provider internet user.
 
 config GSM_INTERNET_PASSWORD
-    string "Internet password"
+    string "GSM Internet password"
 	default ""
 	help
 		Network provider internet password
-		
+
 config GSM_APN
-    string "Internet APN"
+    string "GSM Internet APN"
     default "playmetric"
     help
        APN from network provider for internet access
 
-endmenu
+config UART1_TX_PIN
+    int "PPP serial TX GPIO"
+    default 17
+    range 0 31
+    help
+       Pin to configure for UART1 TX
+
+config UART1_RX_PIN
+    int "PPP serial RX GPIO"
+    default 16
+    range 0 31
+    help
+       Pin to configure for UART1 RX
+
+config UART1_RTS_PIN
+    int "PPP serial RTS GPIO"
+    default 18
+    range 0 31
+    help
+       Pin to configure for UART1 RTS
+
+config UART1_CTS_PIN
+    int "PPP serial CTS GPIO"
+    default 23
+    range 0 31
+    help
+       Pin to configure for UART1 CTS
+
+endmenu

examples/protocols/pppos_client/main/pppos_client_main.c

@@ -36,6 +36,12 @@ const char *PPP_ApnATReq = "AT+CGDCONT=1,\"IP\",\"" \
                            CONFIG_GSM_APN \
                            "\"";
 
+/* Pins used for serial communication with GSM module */
+#define UART1_TX_PIN CONFIG_UART1_TX_PIN
+#define UART1_RX_PIN CONFIG_UART1_RX_PIN
+#define UART1_RTS_PIN CONFIG_UART1_RTS_PIN
+#define UART1_CTS_PIN CONFIG_UART1_CTS_PIN
+
 /* UART */
 int uart_num = UART_NUM_1;
 
@@ -208,8 +214,10 @@ static void pppos_client_task()
     //Configure UART1 parameters
     uart_param_config(uart_num, &uart_config);
 
-    //Set UART1 pins(TX: IO17, RX: IO16, RTS: IO18, CTS: IO23)
-    uart_set_pin(uart_num, 17, 16, 18, 23);
+    // Configure UART1 pins (as set in example's menuconfig)
+    ESP_LOGI(TAG, "Configuring UART1 GPIOs: TX:%d RX:%d RTS:%d CTS: %d",
+             UART1_TX_PIN, UART1_RX_PIN, UART1_RTS_PIN, UART1_CTS_PIN);
+    uart_set_pin(uart_num, UART1_TX_PIN, UART1_RX_PIN, UART1_RTS_PIN, UART1_CTS_PIN);
     uart_driver_install(uart_num, BUF_SIZE * 2, BUF_SIZE * 2, 0, NULL, 0);
 
     while (1) {
@@ -285,8 +293,4 @@ void app_main()
 {
     tcpip_adapter_init();
     xTaskCreate(&pppos_client_task, "pppos_client_task", 2048, NULL, 5, NULL);
-
-    while (1) {
-        vTaskDelay(1000 / portTICK_RATE_MS);
-    }
 }