Unable to get OS 2.0 simulator running on Mac

[JimFB]

I am unable to get the OS 2.0 simulator (v0.5.6, as downloaded through Fitbit Studio) to run on Mac High Sierra (v10.13.4). I am receiving the following in a dialog box when I try to run the simulator:

Simulator failed to start: getaddrinfo ENOTFOUND localhost

localhost:63981, getaddrinfo ENOTFOUND localhost

localhost:63982

The following is showing up in the log file:

[2018-05-10 17:15:51.886] [error] appsim stderr: 2018-05-10 17:15:51.738 app[47281:20185698] ASSERT_Log: Type: 26 func_addr: 0x000bf6f0 lr: 0x00000000, file: ../../fb_private/fb_system/fbsys_notification.c, line: 211, func: _removeNotification, expr: false

[2018-05-10 17:15:51.985] [info] appsim stdout: [D][17:15:51.738][] Scheduler starting dispatch time: 1525986951738
Fb_AlarmMgr_Clean is running[A][17:15:51.970][] [I][17:15:51.970][] Houston, this is Ionic!!Simulator control server starting on 127.0.0.1:63981

[A][17:15:51.970][] Press ? anytime for help
[A][17:15:51.970][] Version: 32.4.19 (Apr 18 2018 15:44:42): Fake for tests
[A][17:15:51.970][] GNU_BUILD_ID:

mfgtst $
[2018-05-10 17:15:51.986] [error] appsim stderr: [2018/05/10 17:15:51:9708] NOTICE: libuv support not compiled in
[2018/05/10 17:15:51:9743] NOTICE: Creating Vhost 'default' port -1, 1 protocols, IPv6 off
[2018/05/10 17:15:51:9758] NOTICE: created client ssl context for default
[2018/05/10 17:15:51:9758] NOTICE: Creating Vhost 'default' port 63981, 1 protocols, IPv6 off

[2018-05-10 17:15:52.001] [error] appsim stderr: 2018-05-10 17:15 app[47281] (FSEvents.framework) FSEventStreamCreate: _FSEventStreamCreate: ERROR: could not allocate 0 bytes for array of path strings

[2018-05-10 17:15:52.002] [error] appsim stderr: 2018-05-10 17:15 app[47281] (FSEvents.framework) FSEventStreamScheduleWithRunLoop(): failed assertion 'streamRef != NULL'

2018-05-10 17:15 app[47281] (FSEvents.framework) FSEventStreamStart(): failed assertion 'streamRef != NULL'

[2018-05-10 17:15:52.609] [warn] 10 retries left: Error: getaddrinfo ENOTFOUND localhost localhost:63981
[2018-05-10 17:15:52.609] [warn] 10 retries left: Error: getaddrinfo ENOTFOUND localhost localhost:63982
... (does this 8 more times for 9, 8, 7, etc)

[2018-05-10 17:16:37.681] [warn] 1 retries left: Error: getaddrinfo ENOTFOUND localhost localhost:63981
[2018-05-10 17:16:37.682] [warn] 1 retries left: Error: getaddrinfo ENOTFOUND localhost localhost:63982

If I try to execute the app via sudo at the command line, I get the following in response (ie, in the terminal shell):

[2018-05-10 17:21:31.845] [error] appsim stderr: 2018-05-10 17:21:31.679 app[47416:20203958] Calling FB_Assert_Fatal:
2018-05-10 17:21:31.680 app[47416:20203958] file: ../../fb_private/fb_system/fbsys_pkg_mgr.c
2018-05-10 17:21:31.680 app[47416:20203958] line: 289
2018-05-10 17:21:31.680 app[47416:20203958] func: (null)
2018-05-10 17:21:31.680 app[47416:20203958] msg : (null)
2018-05-10 17:21:31.680 app[47416:20203958] LR : 0x00000000

[2018-05-10 17:21:31.884] [info] appsim exit code: null (signal SIGABRT)
[2018-05-10 17:21:32.543] [warn] 10 retries left: Error: getaddrinfo ENOTFOUND localhost localhost:63981

... (ie, a bunch more retries before it finally quits retrying)

Any thoughts or suggestions?  (Initially, it was also complaining about a non-existent "root/Library/Application Support/Fitbit OS Simulator/user-settings" directory - I created "root/Library/Application Support/Fitbit OS Simulator/", and then it seemed to manage to create "user-settings" on the next invocation - but I'm still getting the above error(s).

[JonFitbit · Accepted solution]

It sounds like your Mac networking is broken.

Are you able to `ping localhost` from a terminal window?

$ ping localhost
PING localhost (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.077 ms

Have you incorrectly edited your /etc/hosts file perhaps?

$ cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1	localhost
255.255.255.255	broadcasthost
::1             localhost

[JimFB]

Shazam!! You're awesome!! (And clairvoyant, too, apparently! 🙂

I've recently moved to a new Mac, and for whatever reason, my hosts file was empty. Once I added the localhost info in, all is now good.

THANK YOU!!