def sendStateMessages(self):
     # send:
     #   PressureMessage
     #   StateMessage
     #   should maybe also send RedHerringBatteryStatusMessage
     # 
     # These should match the DepthCalibration message used:
     depth_offset = -9.48232
     depth_mult = 0.010395
     depth = float(-self.displacement[2])
     pressure = int((depth - depth_offset) / depth_mult)
     # if somehow we're floating above the surface...
     if pressure < 0:
         pressure = 0
     
     orientation = base_model.orientationToYPR(self.orientation)
     #print 'pressure=', pressure, 'orientation=', orientation
     self.node.send(messaging.PressureMessage(pressure, pressure))
     self.node.send(messaging.StateMessage(orientation))
p_SetMotorMapMessage = pp.Group(l \
    + p_MotorID + c \
    + p_MotorMap \
    + r).streamline()
p_SetMotorMapMessage.setParseAction(lambda x: messaging.SetMotorMapMessage(*x[0]))
p_ResetMCBMessage = pp.Group(l \
    + r).streamline()
p_ResetMCBMessage.setParseAction(lambda x: messaging.ResetMCBMessage(*x[0]))
p_CalibrateNoRotationMessage = pp.Group(l \
    + p_int \
    + r).streamline()
p_CalibrateNoRotationMessage.setParseAction(lambda x: messaging.CalibrateNoRotationMessage(*x[0]))
p_StateMessage = pp.Group(l \
    + p_floatYPR \
    + r).streamline()
p_StateMessage.setParseAction(lambda x: messaging.StateMessage(*x[0]))
p_TelemetryMessage = pp.Group(l \
    + p_floatYPR + c \
    + p_float \
    + r).streamline()
p_TelemetryMessage.setParseAction(lambda x: messaging.TelemetryMessage(*x[0]))
p_BatteryUseMessage = pp.Group(l \
    + p_float + c \
    + p_float + c \
    + p_float \
    + r).streamline()
p_BatteryUseMessage.setParseAction(lambda x: messaging.BatteryUseMessage(*x[0]))
p_ProcessStatusMessage = pp.Group(l \
    + p_str + c \
    + p_str + c \
    + p_float + c \