serial port timeout improvement

[mdblack98]

Under certain conditions serial port timeout can be improved -- namely permission or existence problems.

rigctl -m 1020 -r com30 -s 4800 -vvvvv -Z
2023-01-12T10:35:39.352994-0600: ../../src/tests/rigctl.c(445) Startup: rigctl -m 1020 -r com30 -s 4800 -vvvvv -Z
2023-01-12T10:35:39.353102-0600: rigctl Hamlib 4.6~git Jan 10 05:26:15Z 2023 SHA=00dce9
2023-01-12T10:35:39.353149-0600: Report bugs to hamlib-developer@lists.sourceforge.net

2023-01-12T10:35:39.353204-0600: rig_check_rig_caps: p1=00007fffcca0a960, p2=00007fffcca10ed8, rig_model=00007fffcca0a960, macro_name=00007fffcca10ed8
2023-01-12T10:35:39.353270-0600: yaesu: initrigs4_yaesu called
2023-01-12T10:35:39.353390-0600: rig_init: rig_model=Yaesu FT-817
2023-01-12T10:35:39.353450-0600: rig_init: rig has VFO_A
2023-01-12T10:35:39.353494-0600: rig_init: rig has VFO_B
2023-01-12T10:35:39.353537-0600: ft817_init: called, version 20220419.0
2023-01-12T10:35:39.353601-0600: 1:rig.c(819):rig_open entered
2023-01-12T10:35:39.353655-0600: rig_settings_get_path: path=.hamlib_settings
2023-01-12T10:35:39.353731-0600: rig_settings_load_all: settings_file (.hamlib_settings): No such file or directory
2023-01-12T10:35:39.353781-0600: rig_open: cwd=C:\JTSDK64-Tools\tools\hamlib\qt\5.15.2\bin
2023-01-12T10:35:39.353850-0600: rig_open: C:\JTSDK64-Tools\tools\hamlib\qt\5.15.2\bin/hamlib_settings does not exist
2023-01-12T10:35:39.353896-0600: rig_open: async_data_enable=0, async_data_supported=0
2023-01-12T10:35:39.353945-0600: serial_open: com30
2023-01-12T10:35:39.354073-0600: serial_open(229): open failed#1
2023-01-12T10:35:39.854635-0600: serial_open(229): open failed#2
2023-01-12T10:35:40.355020-0600: serial_open(229): open failed#3
2023-01-12T10:35:40.855305-0600: serial_open(229): open failed#4
2023-01-12T10:35:41.355918-0600: serial_open: Unable to open com30 - No such file or directory
2023-01-12T10:35:41.356027-0600: port_open: serial_open(com30) status=-6, err=No such file or directory
2023-01-12T10:35:41.356093-0600: rig_open: rs->comm_state==0?=0
2023-01-12T10:35:41.356151-0600: 1:rig.c(1025):rig_open returning(-6) IO error

rig_open: error = com30 No such file or directory

[mdblack98]

For this example reduces error response to 500ms instead of 2000ms

rigctl -m 1020 -r com30 -s 4800 -vvvvv -Z
2023-01-12T11:25:32.635568-0600: ../../src/tests/rigctl.c(445) Startup: rigctl -m 1020 -r com30 -s 4800 -vvvvv -Z
2023-01-12T11:25:32.635651-0600: rigctl Hamlib 4.6~git Jan 12 17:23:11Z 2023 SHA=9c48ec
2023-01-12T11:25:32.635704-0600: Report bugs to hamlib-developer@lists.sourceforge.net

2023-01-12T11:25:32.635763-0600: rig_check_rig_caps: p1=00007fffc634a960, p2=00007fffc6350ed8, rig_model=00007fffc634a960, macro_name=00007fffc6350ed8
2023-01-12T11:25:32.635824-0600: yaesu: initrigs4_yaesu called
2023-01-12T11:25:32.635940-0600: rig_init: rig_model=Yaesu FT-817
2023-01-12T11:25:32.636026-0600: rig_init: rig has VFO_A
2023-01-12T11:25:32.636079-0600: rig_init: rig has VFO_B
2023-01-12T11:25:32.636137-0600: ft817_init: called, version 20220419.0
2023-01-12T11:25:32.636187-0600: 1:rig.c(819):rig_open entered
2023-01-12T11:25:32.636243-0600: rig_settings_get_path: path=.hamlib_settings
2023-01-12T11:25:32.636326-0600: rig_settings_load_all: settings_file (.hamlib_settings): No such file or directory
2023-01-12T11:25:32.636376-0600: rig_open: cwd=C:\JTSDK64-Tools\tools\hamlib\qt\5.15.2\bin
2023-01-12T11:25:32.636441-0600: rig_open: C:\JTSDK64-Tools\tools\hamlib\qt\5.15.2\bin/hamlib_settings does not exist
2023-01-12T11:25:32.636486-0600: rig_open: async_data_enable=0, async_data_supported=0
2023-01-12T11:25:32.636549-0600: serial_open: com30
2023-01-12T11:25:32.636662-0600: serial_open(229): open failed#1
2023-01-12T11:25:33.136835-0600: serial_open: Unable to open com30 - No such file or directory
2023-01-12T11:25:33.136947-0600: port_open: serial_open(com30) status=-6, err=No such file or directory
2023-01-12T11:25:33.136991-0600: rig_open: rs->comm_state==0?=0
2023-01-12T11:25:33.137038-0600: 1:rig.c(1025):rig_open returning(-6) IO error

rig_open: error = com30 No such file or directory