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+Code structure:
+
+setup {
+	set sotfware serial with GSM
+	set hardware serial with GPS
+	set button interrupt
+}
+
+loop {
+	listen for sms commands
+	setting emergency number
+}
+
+on_activation {
+	enable recording pin
+	loop (arbitrary time) {
+		get gps coordinates
+		send with sms
+	}
+}
+
+# Todo
+Test button interrupt sending message
+Test GPS fix
+Test GPS fix on button interrupt
+Combine both