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Receiving packets with an IMST IC880a not working?

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Hi guys,
I have the same setup ic880A-spi with raspberry pi 2 and I can't get any packet. The packet forwarder is started successfully as I see in /var/log/daemon.log
When I start the tx test, it doesn't receive anything

./util_tx_test -f 868
INFO: 1 pkts @868.000000 MHz (BW 125 kHz, SF10, 20B payload) 14 dBm, 1000 ms between each
INFO: waiting to receive a PULL_DATA request on port 1782

On the concentrator side, I see that there are few packets but with bad CRC. They are consequently ignored :

2016-02-29 08:51:56 GMT
[UPSTREAM]
RF packets received by concentrator: 1
CRC_OK: 0.00%, CRC_FAIL: 100.00%, NO_CRC: 0.00%
RF packets forwarded: 0 (0 bytes)
PUSH_DATA datagrams sent: 1 (230 bytes)
PUSH_DATA acknowledged: 0.00%
[DOWNSTREAM]
PULL_DATA sent: 3 (0.00% acknowledged)
PULL_RESP(onse) datagrams received: 0 (0 bytes)
RF packets sent to concentrator: 0 (0 bytes)
TX errors: 0
[GPS]
Invalid gps time reference (age: 1456735916 sec)
END

How can I check that the hardware is working fine? The power led is on but the other leds aren't blinking
What is really strange in my setup, if I send RF packets (from a USB end node that can send basic RF packets or Lorawan packets), things are better:

Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: ##### 2016-02-29 23:00:15 GMT #####
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: ### [UPSTREAM] ###
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # RF packets received by concentrator: 1
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # CRC_OK: 100.00%, CRC_FAIL: 0.00%, NO_CRC: 0.00%
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # RF packets forwarded: 1 (4 bytes)
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # PUSH_DATA datagrams sent: 2 (445 bytes)
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # PUSH_DATA acknowledged: 0.00%
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: ### [DOWNSTREAM] ###
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # PULL_DATA sent: 3 (0.00% acknowledged)
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # PULL_RESP(onse) datagrams received: 0 (0 bytes)
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # RF packets sent to concentrator: 0 (0 bytes)
Mar 1 00:01:15 ttn-gateway ttn-gateway[373]: # TX errors: 0

I am really confused. Can you please help me in finding what's wrong?


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