posix shell: required updates for RPi, bepob, ocpoc, eagle & exxcelsior

- RPi works
- the rest is not tested, and requires a bit more
  (such as uploading the bin/ directory)

posix-configs/ocpoc/px4.config

@@ -1,7 +1,15 @@
+#!/usr/bin/bash
+# PX4 commands need the 'px4-' prefix in bash.
+# (px4-alias.sh is expected to be in the PATH)
+source px4-alias.sh
+
 uorb start
 
 param select /root/rootfs/eeprom/parameters
-param load
+if [ -f /root/rootfs/eeprom/parameters ]
+then
+	param load
+fi
 param set SYS_AUTOSTART 4001
 param set MAV_BROADCAST 1
 param set MAV_TYPE 2