!wip pbdrv/bluetooth: RFCOMM socket API.

This implements the complete RFCOMM socket API, including listen, connect, send
and recv.

Tested via manual ping-pong testing for both listen and connect, against a
Windows desktop.

Author: jaguilar

.vscode/c_cpp_properties.json

@@ -79,6 +79,7 @@
                 "gcc",
                 "MICROPY_MODULE_FROZEN_MPY",
                 "MICROPY_ROM_TEXT_COMPRESSION",
+                "HAVE_UMM_MALLOC=1"
             ],
             "compilerArgs": [
                 "-Wall",
@@ -286,7 +287,8 @@
             ],
             "defines": [
                 "MICROPY_MODULE_FROZEN_MPY",
-                "MICROPY_ROM_TEXT_COMPRESSION"
+                "MICROPY_ROM_TEXT_COMPRESSION",
+                "HAVE_UMM_MALLOC=1"
             ],
             "compilerArgs": [
                 "-mthumb",
@@ -404,7 +406,8 @@
             ],
             "defines": [
                 "MICROPY_MODULE_FROZEN_MPY",
-                "MICROPY_USE_READLINE=1"
+                "MICROPY_USE_READLINE=1",
+                "HAVE_UMM_MALLOC=1",
             ],
             "compilerPath": "/usr/bin/gcc",
             "cStandard": "c11",

bricks/_common/common.mk

@@ -416,6 +416,16 @@ BTSTACK_BLE_SRC_C += $(addprefix lib/btstack/src/ble/,\
 	sm.c \
 	)
 
+BTSTACK_CLASSIC_SRC_C = $(addprefix lib/btstack/src/classic/,\
+	btstack_link_key_db_memory.c \
+	rfcomm.c \
+	sdp_client.c \
+	sdp_client_rfcomm.c \
+	sdp_server.c \
+	sdp_util.c \
+	spp_server.c \
+	)
+
 BTSTACK_SRC_C += $(addprefix lib/btstack/chipset/cc256x/,\
 	btstack_chipset_cc256x.c \
 	)
@@ -519,7 +529,7 @@ SRC_STM32_USB_DEV += $(addprefix lib/pbio/drv/usb/stm32_usbd/,\
 SRC_UMM_MALLOC = lib/umm_malloc/src/umm_malloc.c
 
 ifeq ($(PB_LIB_UMM_MALLOC),1)
-CFLAGS += -I$(PBTOP)/lib/umm_malloc/src
+CFLAGS += -I$(PBTOP)/lib/umm_malloc/src -DHAVE_UMM_MALLOC=1
 endif
 
 # NXT OS
@@ -579,6 +589,7 @@ ifeq ($(PB_LIB_BTSTACK),1)
 ifneq ($(CI_MODE),1)
 OBJ += $(addprefix $(BUILD)/, $(BTSTACK_SRC_C:.c=.o))
 OBJ += $(addprefix $(BUILD)/, $(BTSTACK_BLE_SRC_C:.c=.o))
+OBJ += $(addprefix $(BUILD)/, $(BTSTACK_CLASSIC_SRC_C:.c=.o))
 $(BUILD)/lib/btstack/%.o: CFLAGS += -Wno-error
 endif
 endif

lib/pbio/drv/bluetooth/bluetooth.c

@@ -729,6 +729,10 @@ pbio_error_t pbdrv_bluetooth_close_user_tasks(pbio_os_state_t *state, pbio_os_ti
 
     PBIO_OS_ASYNC_BEGIN(state);
 
+    #if PBDRV_CONFIG_BLUETOOTH_NUM_CLASSIC_CONNECTIONS
+    pbdrv_bluetooth_rfcomm_disconnect_all();
+    #endif // PBDRV_CONFIG_BLUETOOTH_NUM_CLASSIC_CONNECTIONS
+
     for (peri_index = 0; peri_index < PBDRV_CONFIG_BLUETOOTH_NUM_PERIPHERALS; peri_index++) {
         peri = pbdrv_bluetooth_peripheral_get_by_index(peri_index);
         // Await ongoing peripheral user task, requesting cancellation to

lib/pbio/drv/bluetooth/bluetooth.h

@@ -99,6 +99,17 @@ typedef struct {
 
 pbio_error_t pbdrv_bluetooth_inquiry_scan_func(pbio_os_state_t *state, void *context);
 
+// The following functions are defined in each Bluetooth implementation that
+// supports RFCOMM sockets.
+
+// Cancels all pending connection attempts. Called e.g. when the user interrupts
+// execution to drop into the debug REPL.
+void pbdrv_bluetooth_rfcomm_cancel_connection();
+
+// Disconnects all active RFCOMM connections and cleans up all sockets. Called
+// during user program termination.
+void pbdrv_bluetooth_rfcomm_disconnect_all();
+
 #endif // PBDRV_CONFIG_BLUETOOTH
 
 #endif // _INTERNAL_PBDRV_BLUETOOTH_H_