Hey, im playing with MQTT and basically its working but im getting errors after some time of not publishing any informations: https://github.com/holotrack/switch-embassy-rs/blob/main/src/main.rs

```
67.425300 INFO  topic: switch_1, message: [97, 100, 115, 102]
└─ switch_embassy_rs::____embassy_main_task::{async_fn#0} @ src/main.rs:188 
72.442941 INFO  topic: switch_0, message: [97, 100, 115, 102]
└─ switch_embassy_rs::____embassy_main_task::{async_fn#0} @ src/main.rs:188 
72.448427 DEBUG address 192.168.1.1 not in neighbor cache, sending ARP request
└─ smoltcp::iface::interface::{impl#2}::lookup_hardware_addr @ /home/holo/.cargo/registry/src/index.crates.io-6f17d22bba15001f/smoltcp-0.11.0/src/macros.rs:18  
78.587019 INFO  topic: switch_0, message: [97, 100, 115, 102]
└─ switch_embassy_rs::____embassy_main_task::{async_fn#0} @ src/main.rs:188 
97.842774 ERROR ERROR OCCURED: NetworkError
└─ switch_embassy_rs::____embassy_main_task::{async_fn#0} @ src/main.rs:184 
98.344073 ERROR ERROR OCCURED: NetworkError
└─ switch_embassy_rs::____embassy_main_task::{async_fn#0} @ src/main.rs:184 
```
Do i need to somehow sustain connection if there are not new messages for some onger time?