working threads with mpsc::channel

src/gps.rs

@@ -0,0 +1,17 @@
+use anyhow;
+
+use std::sync::mpsc::SyncSender;
+use std::thread;
+use std::time::Duration;
+
+use crate::modem::Msg;
+
+pub fn main(sender: SyncSender<Msg>) -> Result<(), anyhow::Error> {
+    println!("entering GPS sender loop ...");
+    for i in 0..20 {
+        println!("sending GPS message ({}) of 20 ...", i);
+        let _ = sender.send(Msg::Location("{\"lat\": 20.4322, \"long\": 44.5432}".to_string()))?;
+        thread::sleep(Duration::from_millis(2000));
+    }
+    Ok(())
+}