sforkowany z mirror/meshtastic-firmware
83 wiersze
3.5 KiB
Markdown
83 wiersze
3.5 KiB
Markdown
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# Temporary notes to self: delete before sending PR.
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Why sw update is budsted:
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case ESP_GATTS_WRITE_EVT: {
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//
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if (param->write.handle == m_handle) {
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if (param->write.is_prep) {
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m_value.addPart(param->write.value, param->write.len);
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} else {
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setValue(param->write.value, param->write.len);
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}
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log_d(" - Response to write event: New value: handle: %.2x, uuid: %s",
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getHandle(), getUUID().toString().c_str());
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char* pHexData = BLEUtils::buildHexData(nullptr, param->write.value, param->write.len);
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log_d(" - Data: length: %d, data: %s", param->write.len, pHexData);
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free(pHexData);
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Has a 100 byte limit, also it is converting to a fucking string
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## misc todo
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* DONE save auth and packet counts in NVS
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* DONE code deep sleep, leave screen off if waked without button, enter sleep after packet sent or timeout
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* DONE store our session keys to flash and if found, then at boot use them instead of joining.
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* DONE dynamically probe for screen and if not installed - do not use
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* test basic preshared key config and see if it works
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* test more advanced auth and see if it works
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* test that rejoin with advanced auth works
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* test construct node id from macaddr
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* test screen and axp192 probing
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* DONE test that board works when we ignore display
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* test deep sleep
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* test deep sleep with gps & lora off
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* edit readme to be platformio based
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* if current position is near last reported position, only report once per hour
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* measure sleep current / calculate battery life
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* split things network code into a esp32 library on platformio
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* make first public release of "t-beam tracker", empasize battery life and price
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* turn on our led while we are on?
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* experiment with larger SF factors for higher range
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* include battery level in broadcast packet
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* stop calling start join, instead just send a packet and the join attempt will happen automatically
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## eventual / later TODO
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* make longpress forget network joining / force rejoin
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# deep sleep
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## pre sleep
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save packet count to NVS
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save lora state to RTC ram
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turn off GPS
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turn off LORA
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turn off screen - possibly can't use the axp because it kills i2c
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turn off wifi (if using it)
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enter deep sleep - waiting for 5 min timeout or button press
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## on wake
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turn on power the same as normal boot (except do not power on screen if we booted because of timeout - we will be running 'headless')
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reinit all hardware
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show boot screen (if screen is powered)
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restore packet count from NVS
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restore lora state from RTC ram (if possible)
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wait for gps lock (max 5 seconds), when it happens send our packet
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update screen (if screen powered)
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send position via lora and wait for ack (or timeout after FIXME seconds)
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if screen is on wait an extra 5 secs
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enter deep sleep
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# Packet count persistence algorithm:
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On each entry to deep sleep, copy the packet count to flash filesystem. At boot read that value from the flash filesystem. SOLVED: Check flash filesystem wear rules and assume X sleeps per day. How many days is that?
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https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/storage/nvs_flash.html
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https://esp32.com/viewtopic.php?t=3990
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writing once a second a 64 byte NVS record (it is actually 32 bytes for an int key/val pair), that would wear out the flash in a year. Writing once every 5 minutes would be 300 years. yay! Do this.
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On each wake from deep sleep, read the last known packet count from GPS BBR use it for future packet sends (if blank then skip). Each time we send a packet, update the count in the GPS RAM. As long as BBR ram doesn't die this will always work. PROBLEM: What if BBR RAM does die
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