From 172bdead1456d596f019bb5769a479884d272b92 Mon Sep 17 00:00:00 2001
From: Vladan Popovic <vladanovic@gmail.com>
Date: Mon, 20 Jun 2022 01:38:50 +0200
Subject: [PATCH] do a basic AT probe instead of waiting on startup

---
 src/modem.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/modem.rs b/src/modem.rs
index 87f908b..a8e82a8 100644
--- a/src/modem.rs
+++ b/src/modem.rs
@@ -102,8 +102,13 @@ impl<UART: serial::Uart> Modem<UART> {
         pwrkey.set_low().map_err(|_| ModemError::SetupError("Error setting PWRKEY to low.".to_string()))?;
         thread::sleep(Duration::from_millis(1000));
         pwrkey.set_high().map_err(|_| ModemError::SetupError("Error setting PWRKEY to high.".to_string()))?;
-        println!("Waiting 3s for sim module to come online ...");
-        thread::sleep(Duration::from_millis(3000));
+        println!("Waiting for sim module to come online ...");
+        loop {
+            match self.send_command(Command::probe()) {
+                Ok(_) => break,
+                _ => continue,
+            }
+        }
         Ok(())
     }