v1.18.1.r1: Minor Fix (#200)

* sqnsupgrade.py: fix for modem state detection error

Author: Islam Wahdan

esp32/frozen/LTE/sqnsupgrade.py

@@ -165,7 +165,10 @@ def detect_modem_state(self, retry=10, initial_delay=5):
                 s.write(b"AT+SMOD?\r\n")
                 time.sleep_ms(delay)
                 resp = s.read()
-                return self.return_code(resp)
+                try:
+                    return self.return_code(resp)
+                except:
+                    continue
             else:
                 s = UART(1, baudrate=115200, pins=pins, timeout_chars=10)
                 s.write(b"AT\r\n")
@@ -178,7 +181,10 @@ def detect_modem_state(self, retry=10, initial_delay=5):
                     s.write(b"AT+SMOD?\r\n")
                     time.sleep_ms(delay)
                     resp = s.read()
-                    return self.return_code(resp)
+                    try:
+                        return self.return_code(resp)
+                    except:
+                        continue
 
 
     def __run(self, file_path=None, baudrate=921600, port=None, resume=False, load_ffh=False, mirror=False, switch_ffh=False, bootrom=False, rgbled=0x050505, debug=False, pkgdebug=False, atneg=True, max_try=10, direct=True, atneg_only=False, version_only=False):
@@ -535,7 +541,7 @@ def run(ffile, mfile=None, baudrate=921600, retry=False, resume=False, debug=Fal
         fresume = False
         sqnup = sqnsupgrade()
         if sqnup.check_files(ffile, mfile, debug):
-            state = sqnup.detect_modem_state()
+            state = sqnup.detect_modem_state(initial_delay = 10)
             if debug: print('Modem state: {}'.format(state))
             if (not retry) and (not resume):
                 if state == 0:
@@ -563,7 +569,7 @@ def uart(ffh_mode=False, mfile=None, retry=False, resume=False, color=0x050505,
         fretry = False
         fresume = False
         sqnup = sqnsupgrade()
-        state = sqnup.detect_modem_state()
+        state = sqnup.detect_modem_state(initial_delay = 10)
         if (not retry) and (not resume):
             if state == 0:
                 print('Your modem is in recovery mode. You will need to use updater.elf file to upgrade.')