LoRa MBED and Arduino libraries not compatible - arduino

Question

Can anyone work out why I can't get these two libraries to communicate to each other over LoRa?
https://github.com/sandeepmistry/arduino-LoRa
https://github.com/ARMmbed/mbed-semtech-lora-rf-drivers/tree/master/SX1276
I can get each library to communicate with another device using the same lib and even compile the arduino code onto the stm32 and have an stm32 and arduino board talk fine but using one of each library they won't. As far as I can tell it can only be a LoRa settings difference.
Arduino Settings
#define TX_POWER 17 // valid range 2-17 on BOOST_PIN, 2-20 on PA_OUTPUT_RFO_PIN
#define TX_PA_PIN PA_OUTPUT_PA_BOOST_PIN
#define SPREADING_FACTOR 7 // 6 -> 12
#define SIGNAL_BANDWIDTH 250E3 // 125E3 //250E3 //62.5E3
#define LORA_FREQUENCY 915E6
#define SYNC_WORD 0x12
...
while (!LoRa.begin(LORA_FREQUENCY)) {
Serial.println(".");
delay(10);
}
// Configure the LoRa Radio
LoRa.setSpreadingFactor(SPREADING_FACTOR);
LoRa.setSignalBandwidth(SIGNAL_BANDWIDTH);
LoRa.setTxPower(TX_POWER, TX_PA_PIN);
LoRa.setSyncWord(SYNC_WORD);
LoRa.setCodingRate4(5);
LoRa.setPreambleLength(8);
LoRa.disableCrc();
LoRa.disableInvertIQ();
MBED Settings
#define frequency 915E6
#define bandwidth 1 //LoRa: [0: 125 kHz, 1: 250 kHz, 2: 500 kHz, 3: Reserved]
#define datarate 7 // SPREADING FACTOR //LoRa: [6: 64, 7: 128, 8: 256, 9: 512, 10: 1024, 11: 2048, 12: 4096 chips]
#define coderate 1 //LoRa: [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8]
#define bandwidth_afc 0
#define preamble_len 8
#define symb_timeout 0
#define fix_len false
#define crc_on false
#define freq_hop_on false
#define hop_period 0
#define iq_inverted false
#define rx_continuous true
#define power 17
#define fdev 0
#define timeout 100000
...
lora.set_tx_config (modem_type::MODEM_LORA,
power,
fdev,
bandwidth,
datarate,
coderate,
preamble_len,
fix_len,
crc_on,
freq_hop_on,
hop_period,
iq_inverted,
timeout
);
lora.set_rx_config (modem_type::MODEM_LORA,
bandwidth,
datarate,
coderate,
bandwidth_afc,
preamble_len,
symb_timeout,
fix_len,
payload_len,
crc_on,
freq_hop_on,
hop_period,
iq_inverted,
rx_continuous
);
lora.init_radio(&lora_events);
lora.set_channel(frequency);
lora.set_public_network(false);
lora.receive();
Have tried setting both sync words to either 0x12 or 0x34 too.