Add fallback wifi connection

.gitmodules

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+[submodule "pixo/micropython-mpu9x50"]
+	path = pixo/micropython-mpu9x50
+	url = https://github.com/micropython-IMU/micropython-mpu9x50.git

pixo/fallback.py

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+# Setup network
+import network
+import time
+
+# Hardcoded network credentials
+try:
+    import creds
+except ImportError:
+    class creds:
+        WIFI_NETWORKS = [
+            ('', '')
+        ]
+
+# We will attempt connections for this many seconds
+MAX_WAIT = 15
+
+# Setup the wifi connection
+STA_IF = network.WLAN(network.STA_IF)
+
+if not STA_IF.isconnected():
+    for network in creds.WIFI_NETWORKS:
+        if STA_IF.isconnected():
+            break
+        STA_IF.connect(network[0], network[1])
+
+import uftpd

pixo/micropython-mpu9x50

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+Subproject commit 11a6bd72472a8cf22763eb5ac32aa4ce07113fce