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libraries/TinyGSM/tools/AT_Spy/AT_Spy.ino

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+/**************************************************************
+ *
+ * This script just listens in on the communication
+ * between an Arduino and the modem.
+ *
+ * TinyGSM Getting Started guide:
+ *   https://tiny.cc/tinygsm-readme
+ *
+ **************************************************************/
+
+// Set the baud rate between the modem and the board
+#define BAUD_RATE 9600
+
+// Set serial printing out the communication
+#define SPY Serial
+
+// Set serial for input from modem
+#define MODEM_TX Serial1
+
+// Set serial for AT commands (to the module)
+// Use Hardware Serial on Mega, Leonardo, Micro
+// #define BOARD_TX Serial1
+
+// or AltSoftware
+#include <AltSoftSerial.h>
+AltSoftSerial BOARD_TX;
+
+
+void setup() {
+  // Set console baud rate
+  SPY.begin(115200);
+
+  MODEM_TX.begin(BAUD_RATE);
+  BOARD_TX.begin(BAUD_RATE);
+  delay(6000);
+}
+
+void loop()
+{
+  while (MODEM_TX.available()) {
+    SPY.write(MODEM_TX.read());
+  }
+  while (BOARD_TX.available()) {
+    SPY.write(BOARD_TX.read());
+  }
+}