Fix XBee on Energia?

.travis.yml

@@ -31,7 +31,7 @@ env:
     - PLATFORMIO_CI_SRC=tools/test_build PLATFORMIO_CI_ARGS="--project-option='build_flags=-D TINY_GSM_MODEM_M590'    --project-option='framework=energia' --board=lplm4f120h5qr"
     - PLATFORMIO_CI_SRC=tools/test_build PLATFORMIO_CI_ARGS="--project-option='build_flags=-D TINY_GSM_MODEM_ESP8266' --project-option='framework=energia' --board=lplm4f120h5qr"
     - PLATFORMIO_CI_SRC=tools/test_build PLATFORMIO_CI_ARGS="--project-option='build_flags=-D TINY_GSM_MODEM_U201'    --project-option='framework=energia' --board=lplm4f120h5qr"
-    # - PLATFORMIO_CI_SRC=tools/test_build PLATFORMIO_CI_ARGS="--project-option='build_flags=-D TINY_GSM_MODEM_XBEE'    --project-option='framework=energia' --board=lplm4f120h5qr"
+    - PLATFORMIO_CI_SRC=tools/test_build PLATFORMIO_CI_ARGS="--project-option='build_flags=-D TINY_GSM_MODEM_XBEE'    --project-option='framework=energia' --board=lplm4f120h5qr"
 
 install:
     # ChipKIT issue: install 32-bit support for GCC PIC32

src/TinyGsmClientXBee.h

@@ -131,7 +131,7 @@ public:
 
   virtual int read(uint8_t *buf, size_t size) {
     TINY_GSM_YIELD();
-    return at->stream.readBytes(buf, size);
+    return at->stream.readBytes((uint8_t*)buf, size);
   }
 
   virtual int read() {