Add provisioning task, refactor provisioning

Kconfig

@@ -68,4 +68,75 @@ config TTN_BG_TASK_PRIO
         the LoRaWAN radio chip. It needs a high priority as the timing is crucial.
         Higher numbers indicate higher priority.
 
+
+choice TTN_PROVISION_UART
+    prompt "UART for provisioning"
+    default TTN_PROVISION_UART_DEFAULT
+    help
+        Select whether to use UART for listening for provisioning commands.
+        
+        - Default is to use UART0 on pins GPIO1(TX) and GPIO3(RX).
+        - If "Custom" is selected, UART0 or UART1 can be chosen,
+          and any pins can be selected.
+        - If "None" is selected, the feature is not available.
+
+config TTN_PROVISION_UART_DEFAULT
+    bool "Default: UART0, TX=GPIO1, RX=GPIO3, 115,200 baud"
+config TTN_PROVISION_UART_CUSTOM
+    bool "Custom"
+config TTN_PROVISION_UART_NONE
+    bool "None"
+endchoice
+
+choice TTN_PROVISION_UART_INIT
+    prompt "Initialize UART"
+    default TTN_PROVISION_UART_INIT_NO
+    depends on !TTN_PROVISION_UART_NONE
+    help
+        Select whether to initialize the UART, i.e. set the baud rate, the RX and TX
+        pins. If the UART is shared with other features (e.g. the console), it
+        should not be initialized. 
+
+config TTN_PROVISION_UART_INIT_NO
+    bool "No"
+config TTN_PROVISION_UART_INIT_YES
+    bool "Yes"
+endchoice
+
+choice TTN_PROVISION_UART_NUM
+    prompt "UART peripheral for provisioning (0-1)"
+    depends on TTN_PROVISION_UART_CUSTOM
+    default TTN_PROVISION_UART_CUSTOM_NUM_0
+
+config TTN_PROVISION_UART_CUSTOM_NUM_0
+    bool "UART0"
+config TTN_PROVISION_UART_CUSTOM_NUM_1
+    bool "UART1"
+endchoice
+
+config TTN_PROVISION_UART_NUM
+    int
+    default 0 if TTN_PROVISION_UART_DEFAULT || TTN_PROVISION_UART_NONE
+    default 0 if TTN_PROVISION_UART_CUSTOM_NUM_0
+    default 1 if TTN_PROVISION_UART_CUSTOM_NUM_1
+
+config TTN_PROVISION_UART_TX_GPIO
+    int "Provisioning UART TX on GPIO#"
+    depends on TTN_PROVISION_UART_CUSTOM && TTN_PROVISION_UART_INIT_YES
+    range 0 33
+    default 19
+
+config TTN_PROVISION_UART_RX_GPIO
+    int "Provisioning UART RX on GPIO#"
+    depends on TTN_PROVISION_UART_CUSTOM && TTN_PROVISION_UART_INIT_YES
+    range 0 39
+    default 21
+
+config TTN_PROVISION_UART_BAUDRATE
+    int "Provisioning UART baud rate"
+    depends on TTN_PROVISION_UART_CUSTOM && TTN_PROVISION_UART_INIT_YES
+    default 115200
+    range 1200 4000000
+
+
 endmenu