Iridium driver and support

Mavlink module implement HIGH_LATENCY (Iridium)

ROMFS/px4fmu_common/init.d/rcS

@@ -600,6 +600,11 @@ then
 		then
 			mavlink start -d $MAVLINK_COMPANION_DEVICE -b 57600 -r 1000
 		fi
+		if param compare SYS_COMPANION 419200
+		then
+			iridiumsbd start -d /dev/ttyS2
+			mavlink start -d /dev/iridium -b 19200 -m iridium -r 10
+		fi
 		if param compare SYS_COMPANION 1921600
 		then
 			mavlink start -d $MAVLINK_COMPANION_DEVICE -b 921600 -r 20000

cmake/configs/nuttx_px4fmu-v2_default.cmake

@@ -48,6 +48,7 @@ set(config_module_list
 	drivers/bst
 	#drivers/snapdragon_rc_pwm
 	drivers/lis3mdl
+	drivers/iridiumsbd
 
 	#
 	# System commands

cmake/configs/nuttx_px4fmu-v3_default.cmake

@@ -23,6 +23,7 @@ set(config_module_list
 	drivers/hott
 	drivers/hott/hott_sensors
 	drivers/hott/hott_telemetry
+	drivers/iridiumsbd
 	drivers/l3gd20
 	drivers/led
 	drivers/lis3mdl

cmake/configs/nuttx_px4fmu-v4_default.cmake

@@ -50,6 +50,7 @@ set(config_module_list
 	drivers/bma180
 	drivers/bmi160
 	drivers/tap_esc
+	drivers/iridiumsbd
 
 	#
 	# System commands

msg/telemetry_status.msg

@@ -3,6 +3,7 @@ uint8 TELEMETRY_STATUS_RADIO_TYPE_3DR_RADIO = 1
 uint8 TELEMETRY_STATUS_RADIO_TYPE_UBIQUITY_BULLET = 2
 uint8 TELEMETRY_STATUS_RADIO_TYPE_WIRE = 3
 uint8 TELEMETRY_STATUS_RADIO_TYPE_USB = 4
+uint8 TELEMETRY_STATUS_RADIO_TYPE_IRIDIUM = 5
 
 uint64 heartbeat_time			# Time of last received heartbeat from remote system
 uint64 telem_time			# Time of last received telemetry status packet, 0 for none

src/drivers/drv_iridiumsbd.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <stdint.h>
+#include <sys/ioctl.h>
+
+#include "board_config.h"
+
+#define IRIDIUMSBD_DEVICE_PATH	"/dev/iridium"

src/drivers/iridiumsbd/CMakeLists.txt

@@ -0,0 +1,45 @@
+############################################################################
+#
+#   Copyright (c) 2016 PX4 Development Team. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name PX4 nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+px4_add_module(
+	MODULE drivers__iridiumsbd
+	MAIN iridiumsbd
+	STACK 1024
+	STACK_MAIN 1024
+	COMPILE_FLAGS
+		-Os
+	SRCS
+		IridiumSBD.cpp
+		iridiumsbd_params.c
+	DEPENDS
+		platforms__common
+	)