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Implement TCP Heartbeat

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Some users have reported issues where the TCP link to dump1090 can be
lost at times of low traffic density - typically in the middle of the
night. One possible reason for this is that some routers drop the link
if there is no traffic for a predetermined period.

To try and resolve this, dump1090 now sends a 'null' packet consisting
of 7 "0x00" bytes approximately once a  minute if there is no real
received traffic during this time. This packet should be discarded by
the application receiving the dump1090 because it will have an invalid
checksum, and ICAO address 0x000000 is also invalid. However, this null
packet should be enough to keep routers alive.
This commit is contained in:
Malcolm Robb 2014-03-11 01:09:49 +00:00
parent 4a438d6e34
commit f7843c1691
5 changed files with 32 additions and 2 deletions
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6
dump1090.h
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@ -37,7 +37,7 @@
// MinorVer changes when additional features are added, but not for bug fixes (range 00-99)
// DayDate & Year changes for all changes, including for bug fixes. It represent the release date of the update
//
#define MODES_DUMP1090_VERSION "1.08.2302.14"
#define MODES_DUMP1090_VERSION "1.08.1003.14"
// ============================= Include files ==========================
@ -163,6 +163,8 @@
#define MODES_INTERACTIVE_DELETE_TTL 300 // Delete from the list after 300 seconds
#define MODES_INTERACTIVE_DISPLAY_TTL 60 // Delete from display after 60 seconds
#define MODES_NET_HEARTBEAT_RATE 900 // Each block is approx 65mS - default is > 1 min
#define MODES_NET_SERVICES_NUM 6
#define MODES_NET_MAX_FD 1024
#define MODES_NET_INPUT_RAW_PORT 30001
@ -281,6 +283,8 @@ struct { // Internal state
int debug; // Debugging mode
int net; // Enable networking
int net_only; // Enable just networking
int net_heartbeat_count; // TCP heartbeat counter
int net_heartbeat_rate; // TCP heartbeat rate
int net_output_sbs_port; // SBS output TCP port
int net_output_raw_size; // Minimum Size of the output raw data
int net_output_raw_rate; // Rate (in 64mS increments) of output raw data