altoslib/altosui: Carry receiver status around in AltosListenerState

This moves the crc_errors into the new structure and adds a receiver
battery voltage value there as well. Now the receiver status can be
monitored separately from the flight status. That also means that code
receiving state updates should be prepared to accept missing listener
or flight state values.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/altoslib/AltosFlightReader.java b/altoslib/AltosFlightReader.java
index 3039b4dc..34526658 100644
--- a/altoslib/AltosFlightReader.java
+++ b/altoslib/AltosFlightReader.java
@@ -45,4 +45,8 @@ public class AltosFlightReader {
 	public boolean supports_telemetry(int telemetry) { return false; }
 
 	public File backing_file() { return null; }
+
+	public boolean has_monitor_battery() { return false; }
+
+	public double monitor_battery() { return AltosRecord.MISSING; }
 }