fix(nimble): De-register host cb in stack deinit

nimble/transport/esp_ipc/src/hci_esp_ipc.c

@@ -14,6 +14,13 @@
 #include "esp_hci_transport.h"
 #include "esp_hci_internal.h"
 
+static int
+ble_transport_dummy_host_recv_cb(hci_trans_pkt_ind_t type, uint8_t *data, uint16_t len)
+{
+    /* Dummy function */
+    return 0;
+}
+
 static int
 ble_transport_host_recv_cb(hci_trans_pkt_ind_t type, uint8_t *data, uint16_t len)
 {
@@ -45,6 +52,12 @@ ble_transport_ll_init(void)
     hci_transport_host_callback_register(ble_transport_host_recv_cb);
 }
 
+void
+ble_transport_ll_deinit(void)
+{
+    hci_transport_host_callback_register(ble_transport_dummy_host_recv_cb);
+}
+
 void *
 ble_transport_alloc_cmd(void)
 {

nimble/transport/esp_ipc_legacy/src/hci_esp_ipc_legacy.c

@@ -31,3 +31,9 @@ ble_transport_ll_init(void)
 
 }
 
+void
+ble_transport_ll_deinit(void)
+{
+
+}
+

nimble/transport/include/nimble/transport_impl.h

@@ -31,6 +31,8 @@ extern "C" {
 extern void ble_transport_ll_init(void);
 extern void ble_transport_hs_init(void);
 
+extern void ble_transport_ll_deinit(void);
+
 /* APIs to be implemented by HS/LL side of transports */
 extern int ble_transport_to_ll_cmd_impl(void *buf);
 extern int ble_transport_to_ll_acl_impl(struct os_mbuf *om);

nimble/transport/uart_ll/src/hci_uart.c

@@ -243,3 +243,13 @@ ble_transport_ll_init(void)
 
     STAILQ_INIT(&tx_q);
 }
+
+void
+ble_transport_ll_deinit(void)
+{
+    memset(&hci_uart_h4sm, 0, sizeof(hci_uart_h4sm));
+
+    hal_uart_close(MYNEWT_VAL(BLE_TRANSPORT_UART_PORT));
+
+    hal_uart_deinit_cbs();
+}

porting/nimble/include/hal/hal_uart.h

@@ -50,6 +50,11 @@ typedef int (*hal_uart_rx_char)(void *arg, uint8_t byte);
 int hal_uart_init_cbs(int uart, hal_uart_tx_char tx_func,
   hal_uart_tx_done tx_done, hal_uart_rx_char rx_func, void *arg);
 
+/**
+ * De Initialize already registerd callbacks
+ */
+void hal_uart_deinit_cbs(void);
+
 enum hal_uart_parity {
     /** No Parity */
     HAL_UART_PARITY_NONE = 0,

porting/nimble/src/hal_uart.c

@@ -43,6 +43,14 @@ int hal_uart_init_cbs(int uart_no, hal_uart_tx_char tx_func,
     return 0;
 }
 
+void hal_uart_deinit_cbs(void)
+{
+    hci_uart.tx_char = NULL;
+    hci_uart.rx_char = NULL;
+    hci_uart.tx_done = NULL;
+    hci_uart.u_func_arg = NULL;
+}
+
 static void IRAM_ATTR hci_uart_rx_task(void *pvParameters)
 {
     uart_event_t event;

porting/nimble/src/nimble_port.c

@@ -156,6 +156,8 @@ esp_err_t esp_nimble_deinit(void)
 #if !SOC_ESP_NIMBLE_CONTROLLER || !CONFIG_BT_CONTROLLER_ENABLED
     npl_freertos_funcs_deinit();
 #endif
+
+    ble_transport_ll_deinit();
     return ESP_OK;
 }