Haven't found where command replies

[akmitrich]

I am to create an ESL server to control FreeSWITCH calls. I try to follow an outbound socket example. So my FreeSWITCH sent an event stream to my ESL server and ESL server issued a playback command on FreeSWITCH but after this the server got stuck. Logs revealed that the server never returns from playback call. I started reading the source and found there the method send_recv of the EslConnection. The method awaits on a oneshot channel which is ok but I haven't found anywhere in the source code where any reply is sent via this channel.
Please tell me, am I doing something wrong? or is this a bug? or is this a work in progress?

[KaranGauswami]

Hi @akmitrich ,

Could you please share a minimal example so that I can review and check it?

[akmitrich]

The example is quite close to outbound.rs in examples folder...

pub async fn process_call(conn: freeswitch_esl::EslConnection) {
    log::info!("INCOMING {:?}", conn);
    log::trace!("[{:?}] Start Welcome", std::time::SystemTime::now());
    conn.playback("ivr/ivr-welcome.wav").await.unwrap();
    log::trace!(
        "[{:?}] Complete Welcome. Start sleeping",
        std::time::SystemTime::now()
    );
    tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
    log::trace!("[{:?}] Complete sleeping", std::time::SystemTime::now());
    conn.playback("ivr/ivr-you_entered.wav").await.unwrap();
    conn.playback("digits/5.wav").await.unwrap();
    log::trace!("[{:?}] PROCESS STOP", std::time::SystemTime::now());
}

#[tokio::main]
async fn main() {
    env_logger::init();
    let addr = "0.0.0.0:8085";
    log::info!("Wait for calls at {:?}", addr);
    let listener = freeswitch_esl::Esl::outbound(addr).await.unwrap();

    loop {
        let (socket, _) = listener.accept().await.unwrap();
        tokio::spawn(async move { process_call(socket).await });
    }
}

The FreeSWITCH does play "ivr/ivr-welcome.wav" but my server never reaches "Complete Welcome. Start sleeping" line of code.

[akmitrich]

@KaranGauswami seems like I found the root of my problem.
my FreeSWITCH responds with -Err on command event json BACKGROUND_JOB CHANNEL_EXECUTE_COMPLETE which is issued by subscribe call. After that error channel in send_recv awaits forever because if let prevents from sending any command reply on line 155

[akmitrich]

Problem solved: in dialplan there must be full argument in socket app args.

[KaranGauswami]

Fixed the documentation in #14 to include the additional arguments.