One thing you might want to check out is the lora public/private network setting. This uses different start words and occasionally the wrong start word will still work.
The syscfg value for this is: LORA_NODE_PUBLIC_NWK and the default is 0 (meaning it is default to private network) > On Jan 4, 2019, at 11:46 AM, Amr Bekhit <[email protected]> wrote: > > Hello all, > > I'm trying to use mynewt to develop a small LoRa end device using the > Telit RE866 module, which is basically an nRF52832 embedded with an > SX1272 radio. Unfortunately, I'm having a lot of trouble getting the > LoRa stack to consistently join the network successfully. I have my > own gateway and network server setup and have it working well with > another end device that I have, so I'm pretty confident the problem is > not in the backend. > > I've put together a simple mynewt application that attempts to join > the network. You can find it on github at > https://github.com/amrbekhit/mynewt-lora-sandbox. > > Most of the time, the device fails to join the network, but on rare > occasions will succeed. Here is the output of the ln_log command when > it fails: > > 001118 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40927 > 001120 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41119 > 001122 index=2 TX_DONE chan=0 done_time=1524076 cputime=1524104 > 001124 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523114 > 001125 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523118 > 001127 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753310 > 001128 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523112 > 001130 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523116 > 001132 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753308 > > Here it is when it succeeds: > > 002722 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40926 > 002725 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 002726 index=2 TX_DONE chan=0 done_time=1524073 cputime=1524101 > 002728 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523111 > 002730 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523115 > 002731 index=5 RX_DONE chan=0 size=17 slot=0 machdr=20 cputime=7870616 > > I recorded quite a few logs of success and failures, and I've pasted > them at the end of this email in case anyone wants to have a look. I > was examining them thinking that there might be an issue with the > timing of the RX Window1, but couldn't see any significant difference. > > Does anyone have this library working well? Are there perhaps any > configuration options that I missed? > > Thanks, > > Amr > > > -------------------------------------------- > ln_log outputs below: > ==========WORKING LOGS========== > 002722 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40926 > 002725 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 002726 index=2 TX_DONE chan=0 done_time=1524073 cputime=1524101 > 002728 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523111 > 002730 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523115 > 002731 index=5 RX_DONE chan=0 size=17 slot=0 machdr=20 cputime=7870616 > > 008055 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40927 > 008057 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 008059 index=2 TX_DONE chan=0 done_time=1524073 cputime=1524101 > 008061 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523111 > 008062 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523115 > 008064 index=5 RX_DONE chan=0 size=17 slot=0 machdr=20 cputime=7870607 > > 002378 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40927 > 002381 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 002383 index=2 TX_DONE chan=0 done_time=1524073 cputime=1524101 > 002384 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523111 > 002386 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523115 > 002388 index=5 RX_DONE chan=0 size=17 slot=0 machdr=20 cputime=7870608 > > 002148 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40926 > 002150 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 002152 index=2 TX_DONE chan=0 done_time=1524073 cputime=1524101 > 002154 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523111 > 002155 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523115 > 002157 index=5 RX_DONE chan=0 size=17 slot=0 machdr=20 cputime=7870615 > > ==========NON WORKING LOGS========== > 001118 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40927 > 001120 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41119 > 001122 index=2 TX_DONE chan=0 done_time=1524076 cputime=1524104 > 001124 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523114 > 001125 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523118 > 001127 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753310 > 001128 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523112 > 001130 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523116 > 001132 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753308 > > 001462 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40925 > 001464 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41117 > 001466 index=2 TX_DONE chan=0 done_time=1524072 cputime=1524099 > 001468 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523110 > 001469 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523114 > 001471 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753306 > 001472 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523108 > 001474 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523112 > 001476 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753306 > > 001467 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40926 > 001470 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 001471 index=2 TX_DONE chan=0 done_time=1524072 cputime=1524100 > 001473 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523110 > 001475 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523114 > 001476 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753307 > 001478 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523108 > 001480 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523112 > 001481 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753306 > > 001420 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40924 > 001422 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41115 > 001424 index=2 TX_DONE chan=0 done_time=1524070 cputime=1524098 > 001425 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523108 > 001427 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523112 > 001429 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753304 > 001430 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523106 > 001432 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523110 > 001434 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753304 > > 001306 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40926 > 001309 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 001311 index=2 TX_DONE chan=0 done_time=1524075 cputime=1524103 > 001312 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523113 > 001314 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523117 > 001316 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753310 > 001317 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523111 > 001319 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523115 > 001321 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753309 > > 001202 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40924 > 001204 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41116 > 001206 index=2 TX_DONE chan=0 done_time=1524071 cputime=1524098 > 001208 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523109 > 001209 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523113 > 001211 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753305 > 001212 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523107 > 001214 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523111 > 001216 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753304 > > 001049 index=0 TX_SETUP phytxpwr=13 sf=12 bw=0 freq=868100000 cputime=40926 > 001051 index=1 TX_START pwr=0 dr=0 chan=0 airtime=1483 cputime=41118 > 001053 index=2 TX_DONE chan=0 done_time=1524075 cputime=1524102 > 001055 index=3 RX_WIN1_SETUP dr=0 chan=0 timeout=7 cputime=6523113 > 001056 index=4 RX_CFG bw=0 dr=0 sf=12 freq=868100000 cputime=6523117 > 001058 index=5 RX_TIMEOUT chan=0 rxslot=0 cputime=6753311 > 001060 index=6 RX_WIN2 rxslot=1 cont=0 freq=869525000 cputime=7523111 > 001061 index=7 RX_CFG bw=0 dr=0 sf=12 freq=869525000 cputime=7523115 > 001063 index=8 RX_TIMEOUT chan=0 rxslot=1 cputime=7753308
