Presentation fails. MAX_RT bit set.

[Steve1]

Hello, I'm new to MySensors and the nrf24l01+. I'm having trouble getting the
following configuration to work.

ESP8266 Wifi Gateway:
MySensors 1.5.1
NodeMCU devkit 0.9
Nrf24l01+pa+lna
decoupling capacitor

Arduino Sensor Node
Arduino 1.6.5
MySensors 1.5.1
Using BinarySwitchSensor sketch
Nrf24l01+
decoupling capacitor

I can telnet to the wifi gateway and I see...

Trying 10.0.0.22...
Connected to 10.0.0.22.
Escape character is '^]'.
0;0;3;0;14;Gateway startup complete.

When I start the sensor node, I see it trying to present itself, but something fails.

send: 108-108-101-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=fail:1.5.1

The returned SPI status is 0x1E, which has the MAX_RT bit set. It appears this is
what is causing the fail status.

Other sensor node details:

STATUS		 = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
RX_ADDR_P0-1	 0xa8a8e1fc6c 0xa8a8e1fc6c
RX_ADDR_P2-5	 0xff 0xc4 0xc5 0xc6
TX_ADDR		 = 0xa8a8e1fc65
RX_PW_P0-6	 0x20 0x20 0x20 0x00 0x00 0x00
EN_AA		 = 0x3b
EN_RXADDR	 0x07
RF_CH		 = 0x4c
RF_SETUP	 0x07
CONFIG		 = 0x0e
DYNPD/FEATURE	 0x3f 0x06
Data Rate	 = 1MBPS
Model		 = nRF24L01+
CRC Length	 = 16 bits
PA Power	 = PA_MAX

Any ideas? Is there something I else I can do to diagnose the problem? Thanks!