[sr-dev] [kamailio/kamailio] invalid json doc in command "kamctl ping" (#2781)

[Christoph Valentin]

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### Description

Hello Daniel,

https://lists.kamailio.org/pipermail/sr-users/2021-January/111628.html

> On Mon, Jan 18, 2021 at 4:19 PM Julia Bo <juliabo at gmail.com> wrote:
>
> It's my mistake, I checked a different branch. Sorry.
> Now I get the same result as yours.
> But in jason we get the result of command execution only and no sip reply
> result (that was in 4.4 : 200,408 etc..)
> I see sent OPTIONS and received reply in debug,
> Thank you,
> Julia


I have the same problem:
I get no sip reply result.

[root at vict2-ims3 scherney]# kamctl ping sip:node1.pcscf-1.vict-ims.net
{
  "jsonrpc":  "2.0",
  "result": {
  },
  "id": 12213
}


Hello,

I implemented an alternative rpc command that blocks waiting for the
response. Try again with latest master and let's see if works.

It waits for max 80secs for the sip reply to come back (or the transaction
to time out), checking every 0.1sec. Later I can make these values
modparams, for now just to validate it works.

Cheers,
Daniel


Can you please tell me, which commit it was, that I can test it at another version.
Thanks!

BR
Theo

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### Troubleshooting

#### Reproduction

[root at vict2-ims3 scherney]# kamctl ping sip:node1.pcscf-1.vict-ims.net
{
  "jsonrpc":  "2.0",
  "result": {
  },
  "id": 12213
}


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#### Debugging Data

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```none```

#### Log Messages

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```none```

#### SIP Traffic

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```[pr0071_030.zip](https://github.com/kamailio/kamailio/files/6648588/pr0071_030.zip)```

### Possible Solutions

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### Additional Information

  * **Kamailio Version** - output of `kamailio -v`
```version: kamailio 5.1.6 (x86_64/linux) 42b01a
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 42b01a
compiled on 10:29:16 May 12 2021```

* **Operating System**:

<!--
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Kernel details (output of `uname -a`)
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```Linux vict-ims3 3.10.0-327.10.1.el7.x86_64 #1 SMP Sat Jan 23 04:54:55 EST 2016 x86_64 x86_64 x86_64 GNU/Linux```


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